| Abbott |
 "A"
Surnames |
1 |
| Adams | "A" Surnames | 1 |
| Adlam | "A" Surnames | 2 |
| Ahearn | "A" Surnames | 3 |
| Ahern | "A" Surnames | 30 |
| Aherne | "A" Surnames | 1 |
| Alender | "A" Surnames | 1 |
| Alexander | "A" Surnames | 4 |
| Allen | "A" Surnames | 22 |
| Allenden | "A" Surnames | 1 |
| Allender | "A" Surnames | 6 |
| Allison | "A" Surnames | 1 |
| Allman | "A" Surnames | 2 |
| Alpin | "A" Surnames | 1 |
| Amberson | "A" Surnames | 1 |
| Anderson | "A" Surnames | 4 |
| Anglam | "A" Surnames | 1 |
| Anglim | "A" Surnames | 6 |
| Anglin | "A" Surnames | 2 |
| Anglum | "A" Surnames | 4 |
| Angly | "A" Surnames | 1 |
| Arby | "A" Surnames | 1 |
| Archdeacon | "A" Surnames | 1 |
| Argill | "A" Surnames | 1 |
| Arkins | "A" Surnames | 5 |
| Armitage | "A" Surnames | 2 |
| Armstrong | "A" Surnames | 80 |
| Arthur | "A" Surnames | 67 |
| Arthurs | "A" Surnames | 1 |
| Ashe | "A" Surnames | 1 |
| Ashworth | "A" Surnames | 1 |
| Atcheson | "A" Surnames | 2 |
| Atkins | "A" Surnames | 3 |
| Atkinson | "A" Surnames | 1 |
| Austen | "A" Surnames | 1 |
| Austin | "A" Surnames | 7 |
| Ayers | "A" Surnames | 2 |
| Baggott | Baggott to Blake | 11 |
| Bailer | Baggott to Blake | 1 |
| Bailey | Baggott to Blake | 3 |
| Baker | Baggott to Blake | 16 |
| Bakey | Baggott to Blake | 12 |
| Baldwin | Baggott to Blake | 3 |
| Bales | Baggott to Blake | 1 |
| Baley | Baggott to Blake | 1 |
| Ball | Baggott to Blake | 11 |
| Ballinger | Baggott to Blake | 2 |
| Balton | Baggott to Blake | 4 |
| Baltwin | Baggott to Blake | 1 |
| Banatyne | Baggott to Blake | 3 |
| Bane | Baggott to Blake | 5 |
| Bannatyne | Baggott to Blake | 17 |
| Barclay | Baggott to Blake | 11 |
| Barr | Baggott to Blake | 1 |
| Barret | Baggott to Blake | 1 |
| Barrett | Baggott to Blake | 28 |
| Barrington | Baggott to Blake | 9 |
| Barron | Baggott to Blake | 6 |
| Barry | Baggott to Blake | 104 |
| Bartley | Baggott to Blake | 6 |
| Barton | Baggott to Blake | 8 |
| Bateman | Baggott to Blake | 1 |
| Baulton | Baggott to Blake | 1 |
| Baun | Baggott to Blake | 1 |
| Bawn | Baggott to Blake | 1 |
| Baylee | Baggott to Blake | 7 |
| Beaghan | Baggott to Blake | 4 |
| Beahan | Baggott to Blake | 1 |
| Beakey | Baggott to Blake | 1 |
| Beaky | Baggott to Blake | 3 |
| Beary | Baggott to Blake | 4 |
| Beatty | Baggott to Blake | 3 |
| Beauchamp | Baggott to Blake | 3 |
| Beck | Baggott to Blake | 3 |
| Beens | Baggott to Blake | 1 |
| Beevans | Baggott to Blake | 1 |
| Begley | Baggott to Blake | 8 |
| Begly | Baggott to Blake | 2 |
| Behan | Baggott to Blake | 29 |
| Behane | Baggott to Blake | 5 |
| Behen | Baggott to Blake | 10 |
| Beley | Baggott to Blake | 1 |
| Bellet | Baggott to Blake | 1 |
| Bellett | Baggott to Blake | 1 |
| Bellinger | Baggott to Blake | 2 |
| Bellit | Baggott to Blake | 1 |
| Belson | Baggott to Blake | 4 |
| Benn | Baggott to Blake | 1 |
| Bennett | Baggott to Blake | 12 |
| Bennis | Baggott to Blake | 5 |
| Bennnis | Baggott to Blake | 1 |
| Benny | Baggott to Blake | 1 |
| Bentley | Baggott to Blake | 19 |
| Bently | Baggott to Blake | 1 |
| Bergin | Baggott to Blake | 1 |
| Berkary | Baggott to Blake | 1 |
| Bermingham | Baggott to Blake | 7 |
| Bernard | Baggott to Blake | 2 |
| Berry | Baggott to Blake | 1 |
| Bert | Baggott to Blake | 1 |
| Beston | Baggott to Blake | 2 |
| Bethel | Baggott to Blake | 3 |
| Bettel | Baggott to Blake | 1 |
| Bevan | Baggott to Blake | 3 |
| Bevine | Baggott to Blake | 1 |
| Bianconi | Baggott to Blake | 1 |
| Billinger | Baggott to Blake | 1 |
| Bindon | Baggott to Blake | 3 |
| Bingham | Baggott to Blake | 6 |
| Binn | Baggott to Blake | 2 |
| Birch | Baggott to Blake | 1 |
| Birmingham | Baggott to Blake | 18 |
| Blackall | Baggott to Blake | 8 |
| Blackhall | Baggott to Blake | 2 |
| Blackwell | Baggott to Blake | 12 |
| Blair | Baggott to Blake | 9 |
| Blake | Baggott to Blake | 64 |
| Blanch | Blanch to Brennan | 1 |
| Bleach | Blanch to Brennan | 3 |
| Bleache | Blanch to Brennan | 3 |
| Blennerhassett | Blanch to Brennan | 2 |
| Blewitt | Blanch to Brennan | 1 |
| Blood | Blanch to Brennan | 62 |
| Bohan | Blanch to Brennan | 1 |
| Bohanan | Blanch to Brennan | 2 |
| Bohen | Blanch to Brennan | 1 |
| Bolan | Blanch to Brennan | 16 |
| Boland | Blanch to Brennan | 75 |
| Bole | Blanch to Brennan | 1 |
| Boler | Blanch to Brennan | 1 |
| Bolon | Blanch to Brennan | 1 |
| Bolton | Blanch to Brennan | 25 |
| Boltwin | Blanch to Brennan | 1 |
| Bomfield | Blanch to Brennan | 1 |
| Bonfield | Blanch to Brennan | 2 |
| Bonney | Blanch to Brennan | 1 |
| Bonny | Blanch to Brennan | 2 |
| Bonynge | Blanch to Brennan | 2 |
| Booth | Blanch to Brennan | 1 |
| Boreman | Blanch to Brennan | 1 |
| Borough | Blanch to Brennan | 8 |
| Boseman | Blanch to Brennan | 1 |
| Boucher | Blanch to Brennan | 3 |
| Bouchier | Blanch to Brennan | 4 |
| Boufey | Blanch to Brennan | 1 |
| Bougler | Blanch to Brennan | 4 |
| Bourchier | Blanch to Brennan | 6 |
| Bourke | Blanch to Brennan | 40 |
| Bowe | Blanch to Brennan | 1 |
| Bowen | Blanch to Brennan | 1 |
| Bowerman | Blanch to Brennan | 1 |
| Bowler | Blanch to Brennan | 1 |
| Bowles | Blanch to Brennan | 4 |
| Bowman | Blanch to Brennan | 1 |
| Bown | Blanch to Brennan | 1 |
| Boyce | Blanch to Brennan | 8 |
| Boyd | Blanch to Brennan | 2 |
| Boyle | Blanch to Brennan | 17 |
| Boyse | Blanch to Brennan | 2 |
| Bracken | Blanch to Brennan | 1 |
| Bradish | Blanch to Brennan | 1 |
| Bradley | Blanch to Brennan | 20 |
| Bradly | Blanch to Brennan | 2 |
| Bradshaw | Blanch to Brennan | 3 |
| Brady | Blanch to Brennan | 61 |
| Bran | Blanch to Brennan | 6 |
| Branden | Blanch to Brennan | 1 |
| Branley | Blanch to Brennan | 1 |
| Brann | Blanch to Brennan | 7 |
| Brassil | Blanch to Brennan | 6 |
| Brassill | Blanch to Brennan | 4 |
| Bray | Blanch to Brennan | 1 |
| Brazill | Blanch to Brennan | 5 |
| Brazzil | Blanch to Brennan | 2 |
| Brazzill | Blanch to Brennan | 7 |
| Bready | Blanch to Brennan | 1 |
| Breen | Blanch to Brennan | 44 |
| Breene | Blanch to Brennan | 6 |
| Brenan | Blanch to Brennan | 4 |
| Brennan | Blanch to Brennan | 69 |
| Breslane | Breslane to Burgess | 1 |
| Bresnehan | Breslane to Burgess | 1 |
| Brett | Breslane to Burgess | 2 |
| Brew | Breslane to Burgess | 84 |
| Brick | Breslane to Burgess | 2 |
| Bridgeman | Breslane to Burgess | 6 |
| Bridgman | Breslane to Burgess | 1 |
| Brien | Breslane to Burgess | 36 |
| Brigdall | Breslane to Burgess | 2 |
| Brindor | Breslane to Burgess | 1 |
| Brinn | Breslane to Burgess | 1 |
| Brisland | Breslane to Burgess | 2 |
| Brislane | Breslane to Burgess | 2 |
| Britt | Breslane to Burgess | 2 |
| Brode | Breslane to Burgess | 1 |
| Broden | Breslane to Burgess | 4 |
| Broderick | Breslane to Burgess | 17 |
| Brodie | Breslane to Burgess | 1 |
| Brodrick | Breslane to Burgess | 3 |
| Brody | Breslane to Burgess | 32 |
| Brogan | Breslane to Burgess | 26 |
| Brogget | Breslane to Burgess | 1 |
| Broggy | Breslane to Burgess | 2 |
| Brohan | Breslane to Burgess | 4 |
| Brooke | Breslane to Burgess | 4 |
| Brooks | Breslane to Burgess | 13 |
| Broughan | Breslane to Burgess | 6 |
| Broughton | Breslane to Burgess | 1 |
| Brown | Breslane to Burgess | 51 |
| Browne | Breslane to Burgess | 96 |
| Bruce | Breslane to Burgess | 1 |
| Bruggy | Breslane to Burgess | 1 |
| Bruodir | Breslane to Burgess | 2 |
| Bryan | Breslane to Burgess | 3 |
| Buckley | Breslane to Burgess | 12 |
| Bugler | Breslane to Burgess | 13 |
| Bulger | Breslane to Burgess | 7 |
| Bunce | Breslane to Burgess | 7 |
| Bunch | Breslane to Burgess | 1 |
| Bunfield | Breslane to Burgess | 2 |
| Bunton | Breslane to Burgess | 3 |
| Burgess | Breslane to Burgess | 4 |
| Burke | Burke to Byrth | 220 |
| Burley | Burke to Byrth | 4 |
| Burne | Burke to Byrth | 5 |
| Burnell | Burke to Byrth | 3 |
| Burns | Burke to Byrth | 43 |
| Burrell | Burke to Byrth | 2 |
| Burton | Burke to Byrth | 34 |
| Bush | Burke to Byrth | 2 |
| Bushe | Burke to Byrth | 2 |
| Bushel | Burke to Byrth | 1 |
| Bushell | Burke to Byrth | 5 |
| Butler | Burke to Byrth | 121 |
| Butterfield | Burke to Byrth | 3 |
| Byngham | Burke to Byrth | 2 |
| Byrne | Burke to Byrth | 30 |
| Byrnes | Burke to Byrth | 4 |
| Byrns | Burke to Byrth | 3 |
| Byrom | Burke to Byrth | 7 |
| Byrth | Burke to Byrth | 1 |
| Cabey | Cabey to Carmody | 1 |
| Caby | Cabey to Carmody | 4 |
| Cagney | Cabey to Carmody | 1 |
| Cahar | Cabey to Carmody | 2 |
| Caher | Cabey to Carmody | 13 |
| Cahill | Cabey to Carmody | 91 |
| Cahir | Cabey to Carmody | 6 |
| Cahirr | Cabey to Carmody | 5 |
| Cain | Cabey to Carmody | 17 |
| Calaher | Cabey to Carmody | 1 |
| Calanel | Cabey to Carmody | 2 |
| Calcutt | Cabey to Carmody | 18 |
| Callaghan | Cabey to Carmody | 82 |
| Callahan | Cabey to Carmody | 2 |
| Callan | Cabey to Carmody | 2 |
| Callanan | Cabey to Carmody | 13 |
| Callanane | Cabey to Carmody | 5 |
| Callanin | Cabey to Carmody | 1 |
| Callary | Cabey to Carmody | 1 |
| Callenan | Cabey to Carmody | 1 |
| Calley | Cabey to Carmody | 1 |
| Calligan | Cabey to Carmody | 1 |
| Callinan | Cabey to Carmody | 31 |
| Callinane | Cabey to Carmody | 4 |
| Cally | Cabey to Carmody | 1 |
| Cameden | Cabey to Carmody | 1 |
| Cameron | Cabey to Carmody | 1 |
| Camm | Cabey to Carmody | 1 |
| Campbell | Cabey to Carmody | 19 |
| Canavan | Cabey to Carmody | 2 |
| Cangley | Cabey to Carmody | 1 |
| Canneen | Cabey to Carmody | 1 |
| Canning | Cabey to Carmody | 1 |
| Cannivan | Cabey to Carmody | 1 |
| Cannole | Cabey to Carmody | 4 |
| Cannon | Cabey to Carmody | 4 |
| Canny | Cabey to Carmody | 70 |
| Canole | Cabey to Carmody | 16 |
| Canty | Cabey to Carmody | 5 |
| Canulty | Cabey to Carmody | 1 |
| Carey | Cabey to Carmody | 48 |
| Carkil | Cabey to Carmody | 2 |
| Carley | Cabey to Carmody | 1 |
| Carmody | Cabey to Carmody | 147 |
| Carn | Carn to Clanchy | 1 |
| Carney | Carn to Clanchy | 20 |
| Carolan | Carn to Clanchy | 3 |
| Carony | Carn to Clanchy | 1 |
| Caroughan | Carn to Clanchy | 1 |
| Carpenter | Carn to Clanchy | 1 |
| Carr | Carn to Clanchy | 8 |
| Carrick | Carn to Clanchy | 8 |
| Carrig | Carn to Clanchy | 35 |
| Carrige | Carn to Clanchy | 9 |
| Carrigg | Carn to Clanchy | 1 |
| Carroll | Carn to Clanchy | 76 |
| Carroocan | Carn to Clanchy | 1 |
| Carrookan | Carn to Clanchy | 1 |
| Carry | Carn to Clanchy | 1 |
| Carter | Carn to Clanchy | 4 |
| Carthy | Carn to Clanchy | 29 |
| Carty | Carn to Clanchy | 47 |
| Casey | Carn to Clanchy | 139 |
| Cash | Carn to Clanchy | 1 |
| Cashen | Carn to Clanchy | 3 |
| Cashin | Carn to Clanchy | 1 |
| Cassan | Carn to Clanchy | 1 |
| Cassen | Carn to Clanchy | 2 |
| Cassidy | Carn to Clanchy | 25 |
| Castle | Carn to Clanchy | 1 |
| Caswell | Carn to Clanchy | 9 |
| Cathro | Carn to Clanchy | 1 |
| Cavanagh | Carn to Clanchy | 3 |
| Cavey | Carn to Clanchy | 1 |
| Caw | Carn to Clanchy | 1 |
| Cecil | Carn to Clanchy | 1 |
| Chaddock | Carn to Clanchy | 1 |
| Chadwick | Carn to Clanchy | 2 |
| Chambers | Carn to Clanchy | 35 |
| Chaplain | Carn to Clanchy | 1 |
| Chappel | Carn to Clanchy | 1 |
| Cheeter | Carn to Clanchy | 1 |
| Cherry | Carn to Clanchy | 6 |
| Chester | Carn to Clanchy | 2 |
| Christie | Carn to Clanchy | 1 |
| Clahane | Carn to Clanchy | 1 |
| Clancey | Carn to Clanchy | 2 |
| Clanchy | Carn to Clanchy | 9 |
| Clancy | Clancy to Coghlin | 128 |
| Clane | Clancy to Coghlin | 1 |
| Clara | Clancy to Coghlin | 5 |
| Clare | Clancy to Coghlin | 16 |
| Clarey | Clancy to Coghlin | 2 |
| Clarke | Clancy to Coghlin | 24 |
| Clary | Clancy to Coghlin | 2 |
| Cleary | Clancy to Coghlin | 93 |
| Cleed | Clancy to Coghlin | 1 |
| Clifford | Clancy to Coghlin | 5 |
| Cloghessy | Clancy to Coghlin | 11 |
| Cloghesy | Clancy to Coghlin | 1 |
| Clohane | Clancy to Coghlin | 1 |
| Clohessy | Clancy to Coghlin | 18 |
| Cloon | Clancy to Coghlin | 9 |
| Cloone | Clancy to Coghlin | 3 |
| Cloughasey | Clancy to Coghlin | 1 |
| Cloughassy | Clancy to Coghlin | 2 |
| Cloughessy | Clancy to Coghlin | 3 |
| Clowder | Clancy to Coghlin | 1 |
| Cluen | Clancy to Coghlin | 1 |
| Clune | Clancy to Coghlin | 79 |
| Clure | Clancy to Coghlin | 1 |
| Cobey | Clancy to Coghlin | 1 |
| Cody | Clancy to Coghlin | 10 |
| Coffey | Clancy to Coghlin | 57 |
| Cogan | Clancy to Coghlin | 1 |
| Coghlan | Clancy to Coghlin | 33 |
| Coghlin | Clancy to Coghlin | 4 |
| Coghran | Coghran to Connole | 4 |
| Cogoron | Coghran to Connole | 1 |
| Cohen | Coghran to Connole | 4 |
| Cokely | Coghran to Connole | 1 |
| Colbourne | Coghran to Connole | 1 |
| Coleman | Coghran to Connole | 7 |
| Colgan | Coghran to Connole | 2 |
| Colinge | Coghran to Connole | 1 |
| Collen | Coghran to Connole | 1 |
| Collinge | Coghran to Connole | 1 |
| Collins | Coghran to Connole | 162 |
| Colly | Coghran to Connole | 1 |
| Colman | Coghran to Connole | 1 |
| Cologhty | Coghran to Connole | 6 |
| Colpoys | Coghran to Connole | 7 |
| Comane | Coghran to Connole | 1 |
| Comber | Coghran to Connole | 4 |
| Comer | Coghran to Connole | 3 |
| Comerford | Coghran to Connole | 5 |
| Commane | Coghran to Connole | 3 |
| Commins | Coghran to Connole | 1 |
| Commons | Coghran to Connole | 1 |
| Comyn | Coghran to Connole | 44 |
| Comyns | Coghran to Connole | 3 |
| Conaulty | Coghran to Connole | 1 |
| Concannon | Coghran to Connole | 8 |
| Condon | Coghran to Connole | 10 |
| Conheady | Coghran to Connole | 9 |
| Coniff | Coghran to Connole | 1 |
| Conlan | Coghran to Connole | 16 |
| Conlin | Coghran to Connole | 1 |
| Conlon | Coghran to Connole | 4 |
| Conloughty | Coghran to Connole | 1 |
| Connaulty | Coghran to Connole | 1 |
| Connealy | Coghran to Connole | 9 |
| Conneely | Coghran to Connole | 2 |
| Connell | Coghran to Connole | 136 |
| Connellan | Coghran to Connole | 27 |
| Connelly | Coghran to Connole | 1 |
| Connelon | Coghran to Connole | 1 |
| Connery | Coghran to Connole | 3 |
| Connole | Coghran to Connole | 5 |
| Connolly | Connolly to Conway | 30 |
| Connolon | Connolly to Conway | 2 |
| Connor | Connolly to Conway | 68 |
| Connors | Connolly to Conway | 105 |
| Conoal | Connolly to Conway | 1 |
| Conole | Connolly to Conway | 5 |
| Conory | Connolly to Conway | 1 |
| Conoulty | Connolly to Conway | 2 |
| Conra | Connolly to Conway | 1 |
| Conroy | Connolly to Conway | 9 |
| Conry | Connolly to Conway | 5 |
| Consadine | Connolly to Conway | 13 |
| Considen | Connolly to Conway | 1 |
| Considine | Connolly to Conway | 173 |
| Conway | Connolly to Conway | 106 |
| Conyngham | Conyngham to Cotton | 62 |
| Coogeran | Conyngham to Cotton | 1 |
| Cooleen | Conyngham to Cotton | 3 |
| Cooley | Conyngham to Cotton | 8 |
| Coonerty | Conyngham to Cotton | 1 |
| Cooney | Conyngham to Cotton | 73 |
| Coony | Conyngham to Cotton | 1 |
| Cooper | Conyngham to Cotton | 6 |
| Coote | Conyngham to Cotton | 1 |
| Copeland | Conyngham to Cotton | 1 |
| Coppinger | Conyngham to Cotton | 9 |
| Corbett | Conyngham to Cotton | 108 |
| Corbit | Conyngham to Cotton | 1 |
| Corcoran | Conyngham to Cotton | 8 |
| Cordue | Conyngham to Cotton | 1 |
| Coree | Conyngham to Cotton | 2 |
| Corey | Conyngham to Cotton | 1 |
| Cormack | Conyngham to Cotton | 1 |
| Cormick | Conyngham to Cotton | 2 |
| Corney | Conyngham to Cotton | 1 |
| Corry | Conyngham to Cotton | 78 |
| Cory | Conyngham to Cotton | 1 |
| Cosgrave | Conyngham to Cotton | 10 |
| Costello | Conyngham to Cotton | 24 |
| Costelloe | Conyngham to Cotton | 54 |
| Coswell | Conyngham to Cotton | 1 |
| Cotter | Conyngham to Cotton | 32 |
| Cotton | Conyngham to Cotton | 1 |
| Coughlan | Coughlan to Crowe | 11 |
| Coughlin | Coughlan to Crowe | 4 |
| Coulaghty | Coughlan to Crowe | 1 |
| Courcey | Coughlan to Crowe | 1 |
| Courneen | Coughlan to Crowe | 16 |
| Courtney | Coughlan to Crowe | 1 |
| Covey | Coughlan to Crowe | 1 |
| Cowan | Coughlan to Crowe | 1 |
| Cowen | Coughlan to Crowe | 1 |
| Cowey | Coughlan to Crowe | 1 |
| Cox | Coughlan to Crowe | 25 |
| Coy | Coughlan to Crowe | 1 |
| Coyle | Coughlan to Crowe | 1 |
| Coyne | Coughlan to Crowe | 4 |
| Cradom | Coughlan to Crowe | 1 |
| Craig | Coughlan to Crowe | 1 |
| Craigue | Coughlan to Crowe | 1 |
| Cravan | Coughlan to Crowe | 2 |
| Craven | Coughlan to Crowe | 1 |
| Crawford | Coughlan to Crowe | 11 |
| Crawley | Coughlan to Crowe | 2 |
| Cray | Coughlan to Crowe | 1 |
| Crea | Coughlan to Crowe | 3 |
| Cready | Coughlan to Crowe | 3 |
| Creagh | Coughlan to Crowe | 66 |
| Creaghan | Coughlan to Crowe | 1 |
| Creaghane | Coughlan to Crowe | 1 |
| Creahane | Coughlan to Crowe | 2 |
| Creehan | Coughlan to Crowe | 4 |
| Cregan | Coughlan to Crowe | 2 |
| Crehan | Coughlan to Crowe | 4 |
| Crehane | Coughlan to Crowe | 4 |
| Crehen | Coughlan to Crowe | 5 |
| Creighton | Coughlan to Crowe | 4 |
| Crimmin | Coughlan to Crowe | 3 |
| Crimmins | Coughlan to Crowe | 2 |
| Croagh | Coughlan to Crowe | 1 |
| Croal | Coughlan to Crowe | 1 |
| Croax | Coughlan to Crowe | 1 |
| Crofton | Coughlan to Crowe | 1 |
| Crofts | Coughlan to Crowe | 2 |
| Croghan | Coughlan to Crowe | 8 |
| Croker | Coughlan to Crowe | 1 |
| Crolly | Coughlan to Crowe | 1 |
| Cronan | Coughlan to Crowe | 1 |
| Croneen | Coughlan to Crowe | 2 |
| Cronin | Coughlan to Crowe | 7 |
| Crosby | Coughlan to Crowe | 1 |
| Cross | Coughlan to Crowe | 3 |
| Crotty | Coughlan to Crowe | 58 |
| Crow | Coughlan to Crowe | 16 |
| Crowe | Coughlan to Crowe | 142 |
| Crowley | Crowley to Cunneen | 51 |
| Crowlin | Crowley to Cunneen | 1 |
| Crowly | Crowley to Cunneen | 4 |
| Cruhan | Crowley to Cunneen | 1 |
| Cruise | Crowley to Cunneen | 9 |
| Crumeen | Crowley to Cunneen | 1 |
| Crutty | Crowley to Cunneen | 2 |
| Cuddahy | Crowley to Cunneen | 1 |
| Cuddehy | Crowley to Cunneen | 6 |
| Cuddihy | Crowley to Cunneen | 5 |
| Cuddy | Crowley to Cunneen | 1 |
| Cudmore | Crowley to Cunneen | 4 |
| Cuffe | Crowley to Cunneen | 4 |
| Cuilinane | Crowley to Cunneen | 1 |
| Cuinnan | Crowley to Cunneen | 1 |
| Culhane | Crowley to Cunneen | 1 |
| Cull | Crowley to Cunneen | 1 |
| Cullanan | Crowley to Cunneen | 1 |
| Culleany | Crowley to Cunneen | 1 |
| Culleen | Crowley to Cunneen | 1 |
| Culleeny | Crowley to Cunneen | 3 |
| Cullen | Crowley to Cunneen | 16 |
| Culleny | Crowley to Cunneen | 1 |
| Culley | Crowley to Cunneen | 1 |
| Culligan | Crowley to Cunneen | 76 |
| Cullin | Crowley to Cunneen | 1 |
| Cullinan | Crowley to Cunneen | 137 |
| Cullinane | Crowley to Cunneen | 26 |
| Culliney | Crowley to Cunneen | 6 |
| Culling | Crowley to Cunneen | 1 |
| Culliny | Crowley to Cunneen | 10 |
| Cullligan | Crowley to Cunneen | 1 |
| Cullow | Crowley to Cunneen | 6 |
| Culnan | Crowley to Cunneen | 1 |
| Culury | Crowley to Cunneen | 4 |
| Cumeen | Crowley to Cunneen | 1 |
| Cummane | Crowley to Cunneen | 5 |
| Cummerford | Crowley to Cunneen | 5 |
| Cummin | Crowley to Cunneen | 4 |
| Cumming | Crowley to Cunneen | 5 |
| Cummings | Crowley to Cunneen | 1 |
| Cummins | Crowley to Cunneen | 10 |
| Cumusky | Crowley to Cunneen | 1 |
| Cuneen | Crowley to Cunneen | 2 |
| Cunnane | Crowley to Cunneen | 2 |
| Cunneen | Crowley to Cunneen | 32 |
| Cunningham | Cunningham to Custy | 79 |
| Cunnyngham | Cunningham to Custy | 1 |
| Curley | Cunningham to Custy | 4 |
| Curran | Cunningham to Custy | 7 |
| Curren | Cunningham to Custy | 1 |
| Currig | Cunningham to Custy | 1 |
| Currin | Cunningham to Custy | 1 |
| Curry | Cunningham to Custy | 39 |
| Curtain | Cunningham to Custy | 12 |
| Curtan | Cunningham to Custy | 1 |
| Curtayne | Cunningham to Custy | 1 |
| Curtin | Cunningham to Custy | 117 |
| Curtis | Cunningham to Custy | 18 |
| Cusack | Cunningham to Custy | 93 |
| Cushen | Cunningham to Custy | 5 |
| Cushon | Cunningham to Custy | 2 |
| Cussen | Cunningham to Custy | 7 |
| Cussin | Cunningham to Custy | 7 |
| Custy | Cunningham to Custy | 14 |
| D'Arcy | D'Arcy to Devinish | 23 |
| D'Esterre | D'Arcy to Devinish | 4 |
| Daffey | D'Arcy to Devinish | 10 |
| Daffy | D'Arcy to Devinish | 23 |
| Dalton | D'Arcy to Devinish | 9 |
| Daly | D'Arcy to Devinish | 159 |
| Danagher | D'Arcy to Devinish | 2 |
| Danaher | D'Arcy to Devinish | 10 |
| Danalin | D'Arcy to Devinish | 1 |
| Daniher | D'Arcy to Devinish | 1 |
| Darcey | D'Arcy to Devinish | 3 |
| Darcy | D'Arcy to Devinish | 40 |
| Dargan | D'Arcy to Devinish | 2 |
| Darmody | D'Arcy to Devinish | 1 |
| Dartnell | D'Arcy to Devinish | 1 |
| Davan | D'Arcy to Devinish | 1 |
| Daven | D'Arcy to Devinish | 1 |
| Davenport | D'Arcy to Devinish | 3 |
| Daveren | D'Arcy to Devinish | 1 |
| Daverin | D'Arcy to Devinish | 1 |
| Davern | D'Arcy to Devinish | 26 |
| Davidson | D'Arcy to Devinish | 1 |
| Davies | D'Arcy to Devinish | 2 |
| Davin | D'Arcy to Devinish | 1 |
| Davine | D'Arcy to Devinish | 3 |
| Davis | D'Arcy to Devinish | 36 |
| Davoran | D'Arcy to Devinish | 22 |
| Davoren | D'Arcy to Devinish | 3 |
| Davorin | D'Arcy to Devinish | 1 |
| Davorn | D'Arcy to Devinish | 1 |
| Dawson | D'Arcy to Devinish | 3 |
| Daxon | D'Arcy to Devinish | 6 |
| Day | D'Arcy to Devinish | 1 |
| De Burgh | D'Arcy to Devinish | 1 |
| De La Haye | D'Arcy to Devinish | 1 |
| De Rovigo | D'Arcy to Devinish | 11 |
| Dea | D'Arcy to Devinish | 7 |
| Deane | D'Arcy to Devinish | 2 |
| Dee | D'Arcy to Devinish | 1 |
| Deegan | D'Arcy to Devinish | 4 |
| Deegedan | D'Arcy to Devinish | 1 |
| Deegidan | D'Arcy to Devinish | 2 |
| Deely | D'Arcy to Devinish | 5 |
| Deering | D'Arcy to Devinish | 5 |
| Delahery | D'Arcy to Devinish | 1 |
| Delahunty | D'Arcy to Devinish | 1 |
| Delaney | D'Arcy to Devinish | 1 |
| Delany | D'Arcy to Devinish | 5 |
| Delmege | D'Arcy to Devinish | 5 |
| Delohery | D'Arcy to Devinish | 11 |
| Deloohery | D'Arcy to Devinish | 1 |
| Deloughery | D'Arcy to Devinish | 2 |
| Deloughry | D'Arcy to Devinish | 4 |
| Deloughty | D'Arcy to Devinish | 1 |
| Dempsey | D'Arcy to Devinish | 1 |
| Denihan | D'Arcy to Devinish | 1 |
| Denniston | D'Arcy to Devinish | 2 |
| Devane | D'Arcy to Devinish | 2 |
| Devenport | D'Arcy to Devinish | 3 |
| Devereux | D'Arcy to Devinish | 7 |
| Devine | D'Arcy to Devinish | 6 |
| Devinish | D'Arcy to Devinish | 1 |
| Devitt | Devitt to Donohoe | 40 |
| Devlin | Devitt to Donohoe | 1 |
| Devonport | Devitt to Donohoe | 1 |
| Dexter | Devitt to Donohoe | 1 |
| Diamond | Devitt to Donohoe | 2 |
| Dias | Devitt to Donohoe | 1 |
| Dickson | Devitt to Donohoe | 2 |
| Digan | Devitt to Donohoe | 13 |
| Digidan | Devitt to Donohoe | 3 |
| Dillane | Devitt to Donohoe | 13 |
| Dillon | Devitt to Donohoe | 77 |
| Dinan | Devitt to Donohoe | 15 |
| Dineen | Devitt to Donohoe | 2 |
| Dineford | Devitt to Donohoe | 1 |
| Dinneen | Devitt to Donohoe | 2 |
| Diviney | Devitt to Donohoe | 1 |
| Divney | Devitt to Donohoe | 4 |
| Dixon | Devitt to Donohoe | 12 |
| Dixson | Devitt to Donohoe | 1 |
| Doab | Devitt to Donohoe | 1 |
| Dodd | Devitt to Donohoe | 1 |
| Dogherty | Devitt to Donohoe | 4 |
| Dohan | Devitt to Donohoe | 9 |
| Doheny | Devitt to Donohoe | 2 |
| Doherty | Devitt to Donohoe | 101 |
| Dolaghty | Devitt to Donohoe | 2 |
| Dolan | Devitt to Donohoe | 3 |
| Dollard | Devitt to Donohoe | 1 |
| Dolohenty | Devitt to Donohoe | 1 |
| Doloughty | Devitt to Donohoe | 1 |
| Donahoe | Devitt to Donohoe | 1 |
| Donaldson | Devitt to Donohoe | 1 |
| Donalin | Devitt to Donohoe | 1 |
| Donelan | Devitt to Donohoe | 1 |
| Donellan | Devitt to Donohoe | 3 |
| Donelly | Devitt to Donohoe | 1 |
| Donlan | Devitt to Donohoe | 3 |
| Donlon | Devitt to Donohoe | 1 |
| Donnell | Devitt to Donohoe | 1 |
| Donnellan | Devitt to Donohoe | 91 |
| Donnellon | Devitt to Donohoe | 7 |
| Donnelly | Devitt to Donohoe | 17 |
| Donnolly | Devitt to Donohoe | 1 |
| Donnolon | Devitt to Donohoe | 1 |
| Donoghoe | Devitt to Donohoe | 12 |
| Donoghue | Devitt to Donohoe | 2 |
| Donohoe | Devitt to Donohoe | 83 |
| Donohue | Donohue to Dynan | 33 |
| Donoughoe | Donohue to Dynan | 2 |
| Donovan | Donohue to Dynan | 18 |
| Doody | Donohue to Dynan | 6 |
| Doogan | Donohue to Dynan | 26 |
| Doohan | Donohue to Dynan | 5 |
| Doolaghty | Donohue to Dynan | 5 |
| Doolan | Donohue to Dynan | 12 |
| Dooley | Donohue to Dynan | 4 |
| Dooly | Donohue to Dynan | 9 |
| Dooney | Donohue to Dynan | 1 |
| Doops | Donohue to Dynan | 1 |
| Doorty | Donohue to Dynan | 5 |
| Dore | Donohue to Dynan | 1 |
| Doudle | Donohue to Dynan | 1 |
| Doughan | Donohue to Dynan | 1 |
| Dougherty | Donohue to Dynan | 4 |
| Doughton | Donohue to Dynan | 1 |
| Doulan | Donohue to Dynan | 1 |
| Dounes | Donohue to Dynan | 1 |
| Doupe | Donohue to Dynan | 2 |
| Dowd | Donohue to Dynan | 13 |
| Dowdall | Donohue to Dynan | 4 |
| Dowde | Donohue to Dynan | 1 |
| Dowling | Donohue to Dynan | 18 |
| Downes | Donohue to Dynan | 100 |
| Downey | Donohue to Dynan | 5 |
| Doyle | Donohue to Dynan | 64 |
| Drawney | Donohue to Dynan | 1 |
| Drew | Donohue to Dynan | 3 |
| Drewry | Donohue to Dynan | 1 |
| Driscol | Donohue to Dynan | 1 |
| Driscoll | Donohue to Dynan | 37 |
| Droaney | Donohue to Dynan | 3 |
| Droany | Donohue to Dynan | 2 |
| Droney | Donohue to Dynan | 18 |
| Drooney | Donohue to Dynan | 7 |
| Drury | Donohue to Dynan | 1 |
| Duck | Donohue to Dynan | 1 |
| Duffy | Donohue to Dynan | 4 |
| Dugan | Donohue to Dynan | 3 |
| Duggan | Donohue to Dynan | 29 |
| Duhig | Donohue to Dynan | 2 |
| Duigan | Donohue to Dynan | 1 |
| Dulhunty | Donohue to Dynan | 1 |
| Duloughery | Donohue to Dynan | 1 |
| Dunboyne | Donohue to Dynan | 7 |
| Dundon | Donohue to Dynan | 16 |
| Dundun | Donohue to Dynan | 1 |
| Dunigan | Donohue to Dynan | 1 |
| Dunlavy | Donohue to Dynan | 1 |
| Dunleavy | Donohue to Dynan | 5 |
| Dunlevey | Donohue to Dynan | 1 |
| Dunn | Donohue to Dynan | 1 |
| Dunne | Donohue to Dynan | 8 |
| Durack | Donohue to Dynan | 5 |
| Durick | Donohue to Dynan | 5 |
| Dwiny | Donohue to Dynan | 3 |
| Dwyer | Donohue to Dynan | 73 |
| Dynan | Donohue to Dynan | 11 |
| Eames | "E" Surnames | 5 |
| Earls | "E" Surnames | 14 |
| Edwards | "E" Surnames | 28 |
| Egan | "E" Surnames | 130 |
| Eirton | "E" Surnames | 1 |
| Eligott | "E" Surnames | 2 |
| Elligot | "E" Surnames | 1 |
| Elligott | "E" Surnames | 2 |
| Elliott | "E" Surnames | 13 |
| Ellis | "E" Surnames | 7 |
| Emerson | "E" Surnames | 7 |
| England | "E" Surnames | 4 |
| English | "E" Surnames | 2 |
| Ennis | "E" Surnames | 1 |
| Enright | "E" Surnames | 47 |
| Eustace | "E" Surnames | 19 |
| Evans | "E" Surnames | 5 |
| Everett | "E" Surnames | 2 |
| Eyres | "E" Surnames | 6 |
| Fagan | Fagan to Fitzgerald | 1 |
| Fahey | Fagan to Fitzgerald | 2 |
| Fahy | Fagan to Fitzgerald | 76 |
| Fair | Fagan to Fitzgerald | 1 |
| Faircloth | Fagan to Fitzgerald | 6 |
| Falahy | Fagan to Fitzgerald | 1 |
| Fall | Fagan to Fitzgerald | 1 |
| Fallahee | Fagan to Fitzgerald | 5 |
| Fallahy | Fagan to Fitzgerald | 2 |
| Fallihy | Fagan to Fitzgerald | 1 |
| Fallon | Fagan to Fitzgerald | 4 |
| Falsey | Fagan to Fitzgerald | 1 |
| Falsy | Fagan to Fitzgerald | 1 |
| Falvey | Fagan to Fitzgerald | 6 |
| Farrell | Fagan to Fitzgerald | 38 |
| Faul | Fagan to Fitzgerald | 9 |
| Favier | Fagan to Fitzgerald | 1 |
| Fawl | Fagan to Fitzgerald | 2 |
| Fawle | Fagan to Fitzgerald | 3 |
| Fawls | Fagan to Fitzgerald | 1 |
| Fawsett | Fagan to Fitzgerald | 1 |
| Feber | Fagan to Fitzgerald | 1 |
| Feehery | Fagan to Fitzgerald | 2 |
| Feehy | Fagan to Fitzgerald | 1 |
| Fegan | Fagan to Fitzgerald | 1 |
| Feneral | Fagan to Fitzgerald | 1 |
| Fennell | Fagan to Fitzgerald | 30 |
| Fennessy | Fagan to Fitzgerald | 7 |
| Ferber | Fagan to Fitzgerald | 1 |
| Fere | Fagan to Fitzgerald | 1 |
| Ferguson | Fagan to Fitzgerald | 3 |
| Ferreter | Fagan to Fitzgerald | 2 |
| Ferriter | Fagan to Fitzgerald | 2 |
| Ferritt | Fagan to Fitzgerald | 1 |
| Ferry | Fagan to Fitzgerald | 1 |
| Fetherstone | Fagan to Fitzgerald | 1 |
| Finch | Fagan to Fitzgerald | 2 |
| Finigan | Fagan to Fitzgerald | 1 |
| Finn | Fagan to Fitzgerald | 26 |
| Finnell | Fagan to Fitzgerald | 4 |
| Finnucan | Fagan to Fitzgerald | 1 |
| Finucane | Fagan to Fitzgerald | 82 |
| Firman | Fagan to Fitzgerald | 3 |
| Fitzgerald | Fagan to Fitzgerald | 294 |
| Fitzgerald & Vesci | Fagan to Fitzgerald | 1 |
| Fitzgerald & Vesic | Fagan to Fitzgerald | 2 |
| Fitzgibbon | Fitzgibbon to Fodges | 25 |
| Fitzgibbons | Fitzgibbon to Fodges | 2 |
| Fitzmartin | Fitzgibbon to Fodges | 4 |
| Fitzmaurice | Fitzgibbon to Fodges | 5 |
| Fitzmorris | Fitzgibbon to Fodges | 1 |
| Fitzpatrick | Fitzgibbon to Fodges | 103 |
| Fitzsimon | Fitzgibbon to Fodges | 2 |
| Fitzsimons | Fitzgibbon to Fodges | 1 |
| Flahavan | Fitzgibbon to Fodges | 1 |
| Flaherty | Fitzgibbon to Fodges | 42 |
| Flahif | Fitzgibbon to Fodges | 1 |
| Flahin | Fitzgibbon to Fodges | 1 |
| Flahive | Fitzgibbon to Fodges | 1 |
| Flahy | Fitzgibbon to Fodges | 1 |
| Flanagan | Fitzgibbon to Fodges | 139 |
| Flanagin | Fitzgibbon to Fodges | 1 |
| Flanahan | Fitzgibbon to Fodges | 1 |
| Flanery | Fitzgibbon to Fodges | 3 |
| Flanigan | Fitzgibbon to Fodges | 5 |
| Flannagan | Fitzgibbon to Fodges | 3 |
| Flannery | Fitzgibbon to Fodges | 52 |
| Flannigan | Fitzgibbon to Fodges | 3 |
| Fleming | Fitzgibbon to Fodges | 6 |
| Fletcher | Fitzgibbon to Fodges | 2 |
| FLinn | Fitzgibbon to Fodges | 4 |
| Flood | Fitzgibbon to Fodges | 3 |
| Floyd | Fitzgibbon to Fodges | 4 |
| Floyde | Fitzgibbon to Fodges | 1 |
| Flynn | Fitzgibbon to Fodges | 65 |
| Foady | Fitzgibbon to Fodges | 1 |
| Fodge | Fitzgibbon to Fodges | 1 |
| Fodges | Fitzgibbon to Fodges | 1 |
| Fogarty | Fogarty to Fury | 30 |
| Fogerty | Fogarty to Fury | 1 |
| Foley | Fogarty to Fury | 87 |
| Fondy | Fogarty to Fury | 1 |
| Foody | Fogarty to Fury | 1 |
| Foohy | Fogarty to Fury | 1 |
| Foot | Fogarty to Fury | 1 |
| Foran | Fogarty to Fury | 13 |
| Ford | Fogarty to Fury | 12 |
| Forde | Fogarty to Fury | 14 |
| Foreman | Fogarty to Fury | 2 |
| Forhan | Fogarty to Fury | 4 |
| Forhen | Fogarty to Fury | 1 |
| Forton | Fogarty to Fury | 1 |
| Fosberry | Fogarty to Fury | 6 |
| Foster | Fogarty to Fury | 17 |
| Foudy | Fogarty to Fury | 2 |
| Foundation | Fogarty to Fury | 3 |
| Fox | Fogarty to Fury | 33 |
| Fraley | Fogarty to Fury | 16 |
| Frances | Fogarty to Fury | 1 |
| Francis | Fogarty to Fury | 16 |
| Franklin | Fogarty to Fury | 5 |
| Franks | Fogarty to Fury | 3 |
| Frawley | Fogarty to Fury | 81 |
| Frawly | Fogarty to Fury | 2 |
| Freel | Fogarty to Fury | 2 |
| Freeman | Fogarty to Fury | 12 |
| Frew | Fogarty to Fury | 1 |
| Frost | Fogarty to Fury | 94 |
| Fruen | Fogarty to Fury | 1 |
| Fry | Fogarty to Fury | 1 |
| Fubiety | Fogarty to Fury | 2 |
| Fubrety | Fogarty to Fury | 1 |
| Fury | Fogarty to Fury | 3 |
| Gabbett | Gabbett to Gipson | 20 |
| Gaffney | Gabbett to Gipson | 1 |
| Gahagan | Gabbett to Gipson | 1 |
| Gaheher | Gabbett to Gipson | 1 |
| Galavan | Gabbett to Gipson | 1 |
| Galivan | Gabbett to Gipson | 1 |
| Gallaghan | Gabbett to Gipson | 2 |
| Gallagher | Gabbett to Gipson | 46 |
| Gallaher | Gabbett to Gipson | 6 |
| Gallary | Gabbett to Gipson | 9 |
| Gallery | Gabbett to Gipson | 17 |
| Galliher | Gabbett to Gipson | 3 |
| Gallivan | Gabbett to Gipson | 7 |
| Galvan | Gabbett to Gipson | 2 |
| Galvin | Gabbett to Gipson | 53 |
| Galway | Gabbett to Gipson | 1 |
| Gamble | Gabbett to Gipson | 3 |
| Gannane | Gabbett to Gipson | 1 |
| Gannassy | Gabbett to Gipson | 1 |
| Gannon | Gabbett to Gipson | 2 |
| Garahy | Gabbett to Gipson | 5 |
| Gardin | Gabbett to Gipson | 5 |
| Gardiner | Gabbett to Gipson | 8 |
| Gardner | Gabbett to Gipson | 3 |
| Garing | Gabbett to Gipson | 2 |
| Garner | Gabbett to Gipson | 1 |
| Garnet | Gabbett to Gipson | 3 |
| Garraghy | Gabbett to Gipson | 2 |
| Garrahey | Gabbett to Gipson | 1 |
| Garrahy | Gabbett to Gipson | 19 |
| Garrey | Gabbett to Gipson | 5 |
| Garrihee | Gabbett to Gipson | 2 |
| Garrohy | Gabbett to Gipson | 1 |
| Garry | Gabbett to Gipson | 10 |
| Garvey | Gabbett to Gipson | 52 |
| Garvy | Gabbett to Gipson | 1 |
| Gash | Gabbett to Gipson | 2 |
| Gately | Gabbett to Gipson | 1 |
| Gauze | Gabbett to Gipson | 1 |
| Gavan | Gabbett to Gipson | 10 |
| Gavin | Gabbett to Gipson | 18 |
| Gayer | Gabbett to Gipson | 1 |
| Gaynon | Gabbett to Gipson | 3 |
| Gaynor | Gabbett to Gipson | 3 |
| Gearan | Gabbett to Gipson | 2 |
| Gearn | Gabbett to Gipson | 2 |
| Gearon | Gabbett to Gipson | 2 |
| Geary | Gabbett to Gipson | 5 |
| Geddis | Gabbett to Gipson | 2 |
| Geeran | Gabbett to Gipson | 1 |
| Geerin | Gabbett to Gipson | 1 |
| Gegan | Gabbett to Gipson | 1 |
| Gennane | Gabbett to Gipson | 1 |
| Gennessy | Gabbett to Gipson | 2 |
| Geoghegan | Gabbett to Gipson | 14 |
| George | Gabbett to Gipson | 9 |
| Geraghty | Gabbett to Gipson | 6 |
| Geran | Gabbett to Gipson | 5 |
| Gerrin | Gabbett to Gipson | 1 |
| Gibson | Gabbett to Gipson | 35 |
| Gilday | Gabbett to Gipson | 1 |
| Gilfoyle | Gabbett to Gipson | 1 |
| Gill | Gabbett to Gipson | 2 |
| Gillagen | Gabbett to Gipson | 5 |
| Gillespie | Gabbett to Gipson | 4 |
| Gilligan | Gabbett to Gipson | 12 |
| Gillman | Gabbett to Gipson | 1 |
| Gillowrie | Gabbett to Gipson | 2 |
| Gilmore | Gabbett to Gipson | 2 |
| Giltinane | Gabbett to Gipson | 5 |
| Ginnane | Gabbett to Gipson | 46 |
| Ginnaun | Gabbett to Gipson | 2 |
| Gipson | Gabbett to Gipson | 3 |
| Glass | Glass to Grady | 1 |
| Gleese | Glass to Grady | 1 |
| Gleeson | Glass to Grady | 68 |
| Glenn | Glass to Grady | 2 |
| Glennane | Glass to Grady | 1 |
| Glennon | Glass to Grady | 3 |
| Glenny | Glass to Grady | 1 |
| Glesson | Glass to Grady | 1 |
| Glin | Glass to Grady | 9 |
| Glinn | Glass to Grady | 7 |
| Glinny | Glass to Grady | 4 |
| Gloster | Glass to Grady | 16 |
| Glyn | Glass to Grady | 3 |
| Glynn | Glass to Grady | 51 |
| Glynne | Glass to Grady | 2 |
| Goggin | Glass to Grady | 8 |
| Going | Glass to Grady | 13 |
| Golden | Glass to Grady | 3 |
| Goldinger | Glass to Grady | 1 |
| Gonnan | Glass to Grady | 1 |
| Goold | Glass to Grady | 3 |
| Goolding | Glass to Grady | 1 |
| Goonan | Glass to Grady | 19 |
| Goonane | Glass to Grady | 10 |
| Gooney | Glass to Grady | 2 |
| Gordon | Glass to Grady | 5 |
| Gore | Glass to Grady | 78 |
| Gorman | Glass to Grady | 114 |
| Gormely | Glass to Grady | 1 |
| Gornane | Glass to Grady | 1 |
| Gould | Glass to Grady | 1 |
| Grace | Glass to Grady | 10 |
| Graddy | Glass to Grady | 2 |
| Grady | Glass to Grady | 118 |
| Graham | Graham to Guttry | 3 |
| Granger | Graham to Guttry | 1 |
| Grant | Graham to Guttry | 3 |
| Gray | Graham to Guttry | 8 |
| Gready | Graham to Guttry | 2 |
| Greagan | Graham to Guttry | 1 |
| Greaghan | Graham to Guttry | 1 |
| Greary | Graham to Guttry | 1 |
| Green | Graham to Guttry | 21 |
| Greene | Graham to Guttry | 94 |
| Greer | Graham to Guttry | 1 |
| Gregan | Graham to Guttry | 7 |
| Gregg | Graham to Guttry | 8 |
| Grennan | Graham to Guttry | 1 |
| Griffey | Graham to Guttry | 33 |
| Griffin | Graham to Guttry | 176 |
| Griffins | Graham to Guttry | 1 |
| Griffy | Graham to Guttry | 35 |
| Grimes | Graham to Guttry | 1 |
| Griott | Graham to Guttry | 3 |
| Grogan | Graham to Guttry | 16 |
| Guane | Graham to Guttry | 1 |
| Guare | Graham to Guttry | 1 |
| Guer | Graham to Guttry | 1 |
| Guerin | Graham to Guttry | 11 |
| Guilfoyle | Graham to Guttry | 2 |
| Guillagan | Graham to Guttry | 1 |
| Guillagen | Graham to Guttry | 1 |
| Guinane | Graham to Guttry | 9 |
| Guinea | Graham to Guttry | 2 |
| Guinnane | Graham to Guttry | 2 |
| Guiny | Graham to Guttry | 1 |
| Guiry | Graham to Guttry | 1 |
| Gulligan | Graham to Guttry | 3 |
| Gully | Graham to Guttry | 12 |
| Gunn | Graham to Guttry | 3 |
| Gunnane | Graham to Guttry | 1 |
| Gunning | Graham to Guttry | 1 |
| Gurnel | Graham to Guttry | 1 |
| Gurnell | Graham to Guttry | 2 |
| Guthrie | Graham to Guttry | 35 |
| Gutrie | Graham to Guttry | 1 |
| Gutterie | Graham to Guttry | 5 |
| Guttery | Graham to Guttry | 10 |
| Guttry | Graham to Guttry | 1 |
| Hacket | Hacket to Hanly | 2 |
| Hackett | Hacket to Hanly | 5 |
| Hadlock | Hacket to Hanly | 2 |
| Hagan | Hacket to Hanly | 1 |
| Hagarty | Hacket to Hanly | 4 |
| Hagins | Hacket to Hanly | 1 |
| Haher | Hacket to Hanly | 2 |
| Haherny | Hacket to Hanly | 1 |
| Hahir | Hacket to Hanly | 4 |
| Haire | Hacket to Hanly | 1 |
| Haley | Hacket to Hanly | 4 |
| Hall | Hacket to Hanly | 7 |
| Hallaghan | Hacket to Hanly | 1 |
| Hallanan | Hacket to Hanly | 4 |
| Hallanon | Hacket to Hanly | 1 |
| Hallaran | Hacket to Hanly | 1 |
| Halley | Hacket to Hanly | 1 |
| Hallinan | Hacket to Hanly | 37 |
| Hallonan | Hacket to Hanly | 1 |
| Halloran | Hacket to Hanly | 241 |
| Halloren | Hacket to Hanly | 1 |
| Halnan | Hacket to Hanly | 1 |
| Halnon | Hacket to Hanly | 4 |
| Halpen | Hacket to Hanly | 1 |
| Halpin | Hacket to Hanly | 53 |
| Halvey | Hacket to Hanly | 14 |
| Haly | Hacket to Hanly | 5 |
| Hamberry | Hacket to Hanly | 2 |
| Hambury | Hacket to Hanly | 3 |
| Hamell | Hacket to Hanly | 1 |
| Hamill | Hacket to Hanly | 1 |
| Hamilton | Hacket to Hanly | 8 |
| Hammell | Hacket to Hanly | 1 |
| Hanbury | Hacket to Hanly | 1 |
| Hand | Hacket to Hanly | 1 |
| Haneen | Hacket to Hanly | 12 |
| Hanifer | Hacket to Hanly | 1 |
| Hanigan | Hacket to Hanly | 1 |
| Hanley | Hacket to Hanly | 11 |
| Hanlon | Hacket to Hanly | 7 |
| Hanly | Hacket to Hanly | 9 |
| Hannafin | Hannafin to Hassitt | 1 |
| Hannan | Hannafin to Hassitt | 31 |
| Hanneen | Hannafin to Hassitt | 11 |
| Hannigan | Hannafin to Hassitt | 1 |
| Hannin | Hannafin to Hassitt | 1 |
| Hannon | Hannafin to Hassitt | 5 |
| Hanofin | Hannafin to Hassitt | 1 |
| Hanrahan | Hannafin to Hassitt | 84 |
| Hanrihan | Hannafin to Hassitt | 1 |
| Hara | Hannafin to Hassitt | 2 |
| Haran | Hannafin to Hassitt | 14 |
| Hardgrave | Hannafin to Hassitt | 1 |
| Hardgrove | Hannafin to Hassitt | 4 |
| Harding | Hannafin to Hassitt | 1 |
| Hardinge | Hannafin to Hassitt | 1 |
| Hardy | Hannafin to Hassitt | 9 |
| Hare | Hannafin to Hassitt | 13 |
| Haren | Hannafin to Hassitt | 11 |
| Hargrove | Hannafin to Hassitt | 1 |
| Harhen | Hannafin to Hassitt | 2 |
| Harhin | Hannafin to Hassitt | 8 |
| Harin | Hannafin to Hassitt | 1 |
| Harkin | Hannafin to Hassitt | 5 |
| Harkins | Hannafin to Hassitt | 4 |
| Harley | Hannafin to Hassitt | 3 |
| Harman | Hannafin to Hassitt | 1 |
| Harnen | Hannafin to Hassitt | 1 |
| Harogan | Hannafin to Hassitt | 1 |
| Harragan | Hannafin to Hassitt | 1 |
| Harrahil | Hannafin to Hassitt | 1 |
| Harrahill | Hannafin to Hassitt | 1 |
| Harrigan | Hannafin to Hassitt | 1 |
| Harrington | Hannafin to Hassitt | 2 |
| Harris | Hannafin to Hassitt | 2 |
| Harrison | Hannafin to Hassitt | 10 |
| Harrisson | Hannafin to Hassitt | 3 |
| Hart | Hannafin to Hassitt | 10 |
| Harte | Hannafin to Hassitt | 4 |
| Hartican | Hannafin to Hassitt | 1 |
| Hartigan | Hannafin to Hassitt | 35 |
| Hartnady | Hannafin to Hassitt | 1 |
| Hartneady | Hannafin to Hassitt | 3 |
| Hartnedy | Hannafin to Hassitt | 5 |
| Hartnett | Hannafin to Hassitt | 1 |
| Hartney | Hannafin to Hassitt | 13 |
| Harty | Hannafin to Hassitt | 1 |
| Harvey | Hannafin to Hassitt | 8 |
| Haslin | Hannafin to Hassitt | 1 |
| Hasset | Hannafin to Hassitt | 2 |
| Hassett | Hannafin to Hassitt | 85 |
| Hassit | Hannafin to Hassitt | 3 |
| Hassitt | Hannafin to Hassitt | 4 |
| Hastings | Hastings to Hegarty | 17 |
| Haugh | Hastings to Hegarty | 19 |
| Haughton | Hastings to Hegarty | 2 |
| Haverty | Hastings to Hegarty | 1 |
| Hawe | Hastings to Hegarty | 3 |
| Hawkins | Hastings to Hegarty | 11 |
| Hawkshaw | Hastings to Hegarty | 1 |
| Hawksworth | Hastings to Hegarty | 1 |
| Haye | Hastings to Hegarty | 1 |
| Hayes | Hastings to Hegarty | 156 |
| Heafe | Hastings to Hegarty | 1 |
| Heafey | Hastings to Hegarty | 1 |
| Heafy | Hastings to Hegarty | 2 |
| Heagney | Hastings to Hegarty | 1 |
| Healy | Hastings to Hegarty | 100 |
| Heaney | Hastings to Hegarty | 2 |
| Heany | Hastings to Hegarty | 3 |
| Hearne | Hastings to Hegarty | 1 |
| Heartney | Hastings to Hegarty | 2 |
| Heastin | Hastings to Hegarty | 3 |
| Heath | Hastings to Hegarty | 6 |
| Hedderman | Hastings to Hegarty | 8 |
| Hedican | Hastings to Hegarty | 1 |
| Hedigan | Hastings to Hegarty | 5 |
| Heffernan | Hastings to Hegarty | 11 |
| Hefy | Hastings to Hegarty | 1 |
| Hegarty | Hastings to Hegarty | 27 |
| Heher | Heher to Higgins | 14 |
| Hehir | Heher to Higgins | 135 |
| Heiher | Heher to Higgins | 18 |
| Hellebert | Heher to Higgins | 1 |
| Hely | Heher to Higgins | 2 |
| Hendrick | Heher to Higgins | 2 |
| Henn | Heher to Higgins | 11 |
| Hennessy | Heher to Higgins | 68 |
| Henry | Heher to Higgins | 2 |
| Herbert | Heher to Higgins | 13 |
| Herriher | Heher to Higgins | 1 |
| Hestin | Heher to Higgins | 2 |
| Hetherman | Heher to Higgins | 4 |
| Hevy | Heher to Higgins | 1 |
| Hewit | Heher to Higgins | 2 |
| Hewitt | Heher to Higgins | 10 |
| Hewlet | Heher to Higgins | 1 |
| Hewlett | Heher to Higgins | 2 |
| Hewson | Heher to Higgins | 1 |
| Hiam | Heher to Higgins | 1 |
| Hickaman | Heher to Higgins | 1 |
| Hickey | Heher to Higgins | 159 |
| Hickie | Heher to Higgins | 6 |
| Hickman | Heher to Higgins | 34 |
| Hickson | Heher to Higgins | 2 |
| Higgins | Heher to Higgins | 53 |
| Hihir | Hihir to Honen | 1 |
| Hilary | Hihir to Honen | 3 |
| Hill | Hihir to Honen | 28 |
| Hillard | Hihir to Honen | 1 |
| Hillary | Hihir to Honen | 1 |
| Hillery | Hihir to Honen | 16 |
| Hilliard | Hihir to Honen | 2 |
| Hinchey | Hihir to Honen | 1 |
| Hinchy | Hihir to Honen | 33 |
| Hinds | Hihir to Honen | 1 |
| Hoare | Hihir to Honen | 17 |
| Hodder | Hihir to Honen | 1 |
| Hodge | Hihir to Honen | 2 |
| Hodges | Hihir to Honen | 5 |
| Hodnett | Hihir to Honen | 1 |
| Hoey | Hihir to Honen | 2 |
| Hogan | Hihir to Honen | 256 |
| Hogarty | Hihir to Honen | 1 |
| Hograve | Hihir to Honen | 4 |
| Hogreve | Hihir to Honen | 2 |
| Holaghan | Hihir to Honen | 1 |
| Holland | Hihir to Honen | 8 |
| Hollaran | Hihir to Honen | 4 |
| Hollis | Hihir to Honen | 1 |
| Hollogan | Hihir to Honen | 2 |
| Holloghan | Hihir to Honen | 1 |
| Holloran | Hihir to Honen | 5 |
| Holmes | Hihir to Honen | 6 |
| Holohan | Hihir to Honen | 9 |
| Holorem | Hihir to Honen | 1 |
| Holway | Hihir to Honen | 1 |
| Honan | Hihir to Honen | 64 |
| Honen | Hihir to Honen | 1 |
| Honneen | Honneen to Hynes | 4 |
| Hoolaghan | Honneen to Hynes | 8 |
| Hoolahan | Honneen to Hynes | 33 |
| Hopkins | Honneen to Hynes | 1 |
| Horan | Honneen to Hynes | 12 |
| Horhan | Honneen to Hynes | 1 |
| Horne | Honneen to Hynes | 1 |
| Horrigan | Honneen to Hynes | 2 |
| Hough | Honneen to Hynes | 41 |
| Houghlahan | Honneen to Hynes | 1 |
| Houghlihan | Honneen to Hynes | 1 |
| Houlaghan | Honneen to Hynes | 3 |
| Houlahan | Honneen to Hynes | 12 |
| Houlihan | Honneen to Hynes | 24 |
| Houlohan | Honneen to Hynes | 1 |
| Houneen | Honneen to Hynes | 2 |
| Hourahan | Honneen to Hynes | 4 |
| Hourigan | Honneen to Hynes | 16 |
| Hovendor | Honneen to Hynes | 2 |
| Hoverty | Honneen to Hynes | 1 |
| Howard | Honneen to Hynes | 83 |
| Howe | Honneen to Hynes | 13 |
| Howlett | Honneen to Hynes | 1 |
| Howley | Honneen to Hynes | 36 |
| Howlihan | Honneen to Hynes | 1 |
| Howly | Honneen to Hynes | 1 |
| Howneen | Honneen to Hynes | 1 |
| Hoy | Honneen to Hynes | 1 |
| Hubbert | Honneen to Hynes | 1 |
| Huddy | Honneen to Hynes | 2 |
| Huggart | Honneen to Hynes | 1 |
| Hughes | Honneen to Hynes | 4 |
| Hulett | Honneen to Hynes | 1 |
| Hunt | Honneen to Hynes | 12 |
| Hurley | Honneen to Hynes | 53 |
| Hurly | Honneen to Hynes | 8 |
| Hurst | Honneen to Hynes | 1 |
| Hussy | Honneen to Hynes | 8 |
| Huston | Honneen to Hynes | 1 |
| Hutchison | Honneen to Hynes | 1 |
| Huxley | Honneen to Hynes | 2 |
| Hynes | Honneen to Hynes | 146 |
| Ievers | "I" Surnames | 17 |
| Inchiquin | "I" Surnames | 58 |
| Incho | "I" Surnames | 1 |
| Inskoe | "I" Surnames | 1 |
| Irwin | "I" Surnames | 12 |
| Ivers | "I" Surnames | 1 |
| Jackson | "J" Surnames | 5 |
| James | "J" Surnames | 1 |
| Jannes | "J" Surnames | 4 |
| Jenkins | "J" Surnames | 1 |
| Jennings | "J" Surnames | 4 |
| Jepson | "J" Surnames | 4 |
| Jervis | "J" Surnames | 4 |
| Jervoise | "J" Surnames | 1 |
| Johnson | "J" Surnames | 9 |
| Johnston | "J" Surnames | 4 |
| Johnstone | "J" Surnames | 4 |
| Joice | "J" Surnames | 9 |
| Jolly | "J" Surnames | 6 |
| Joly | "J" Surnames | 3 |
| Jones | "J" Surnames | 21 |
| Jordan | "J" Surnames | 38 |
| Joyce | "J" Surnames | 17 |
| Joynt | "J" Surnames | 4 |
| Judd | "J" Surnames | 1 |
| July | "J" Surnames | 2 |
| Juskoe | "J" Surnames | 1 |
| Kain | Kain to Keavy | 1 |
| Kane | Kain to Keavy | 178 |
| Kane ] | Kain to Keavy | 1 |
| Kanty | Kain to Keavy | 1 |
| Karney | Kain to Keavy | 1 |
| Katy | Kain to Keavy | 3 |
| Kavanagh | Kain to Keavy | 6 |
| Kavy | Kain to Keavy | 1 |
| Kays | Kain to Keavy | 1 |
| Keaghary | Kain to Keavy | 1 |
| Kealty | Kain to Keavy | 1 |
| Kealy | Kain to Keavy | 3 |
| Kean | Kain to Keavy | 18 |
| Keane | Kain to Keavy | 207 |
| Keany | Kain to Keavy | 1 |
| Kearin | Kain to Keavy | 2 |
| Kearn | Kain to Keavy | 9 |
| Kearney | Kain to Keavy | 37 |
| Kearns | Kain to Keavy | 7 |
| Kearse | Kain to Keavy | 3 |
| Keary | Kain to Keavy | 6 |
| Keating | Kain to Keavy | 69 |
| Keaty | Kain to Keavy | 5 |
| Keavan | Kain to Keavy | 2 |
| Keavy | Kain to Keavy | 6 |
| Keeffe | Keeffe to Kelly | 49 |
| Keegan | Keeffe to Kelly | 2 |
| Keehan | Keeffe to Kelly | 8 |
| Keely | Keeffe to Kelly | 1 |
| Keenan | Keeffe to Kelly | 1 |
| Keeran | Keeffe to Kelly | 1 |
| Keerin | Keeffe to Kelly | 1 |
| Keeshan | Keeffe to Kelly | 1 |
| Keevan | Keeffe to Kelly | 1 |
| Keevey | Keeffe to Kelly | 1 |
| Keevin | Keeffe to Kelly | 1 |
| Keiran | Keeffe to Kelly | 2 |
| Keirance | Keeffe to Kelly | 1 |
| Kelaher | Keeffe to Kelly | 1 |
| Keleher | Keeffe to Kelly | 11 |
| Kelleher | Keeffe to Kelly | 5 |
| Kelliher | Keeffe to Kelly | 7 |
| Kelly | Keeffe to Kelly | 450 |
| Kelt | Kelt to Kenyon | 1 |
| Kemmis | Kelt to Kenyon | 1 |
| Kendall | Kelt to Kenyon | 6 |
| Kenerk | Kelt to Kenyon | 1 |
| Kenevane | Kelt to Kenyon | 1 |
| Keniery | Kelt to Kenyon | 3 |
| Kenirey | Kelt to Kenyon | 1 |
| Keniry | Kelt to Kenyon | 4 |
| Kenmare | Kelt to Kenyon | 11 |
| Kenna | Kelt to Kenyon | 15 |
| Kennane | Kelt to Kenyon | 3 |
| Kennedy | Kelt to Kenyon | 137 |
| Kenneely | Kelt to Kenyon | 1 |
| Kennelly | Kelt to Kenyon | 15 |
| Kennely | Kelt to Kenyon | 1 |
| Kennerk | Kelt to Kenyon | 1 |
| Kenniry | Kelt to Kenyon | 1 |
| Kenny | Kelt to Kenyon | 106 |
| Kenyon | Kelt to Kenyon | 1 |
| Keogh | Keogh to Krane | 48 |
| Keough | Keogh to Krane | 6 |
| Kerin | Keogh to Krane | 69 |
| Kerins | Keogh to Krane | 4 |
| Kerrane | Keogh to Krane | 1 |
| Kerrigan | Keogh to Krane | 1 |
| Kerrin | Keogh to Krane | 9 |
| Kerse | Keogh to Krane | 1 |
| Kett | Keogh to Krane | 10 |
| Kevey | Keogh to Krane | 1 |
| Kevin | Keogh to Krane | 1 |
| Kevy | Keogh to Krane | 1 |
| Kidd | Keogh to Krane | 1 |
| Kielly | Keogh to Krane | 1 |
| Kiely | Keogh to Krane | 6 |
| Kieran | Keogh to Krane | 7 |
| Kierce | Keogh to Krane | 9 |
| Kiers | Keogh to Krane | 2 |
| Kilary | Keogh to Krane | 1 |
| Kilbride | Keogh to Krane | 1 |
| Kildaree | Keogh to Krane | 1 |
| Kildea | Keogh to Krane | 5 |
| Kilderry | Keogh to Krane | 6 |
| Kile | Keogh to Krane | 1 |
| Kiley | Keogh to Krane | 12 |
| Kilfoyle | Keogh to Krane | 1 |
| Kilkelly | Keogh to Krane | 8 |
| Killaloe | Keogh to Krane | 14 |
| Killeen | Keogh to Krane | 60 |
| Killen | Keogh to Krane | 1 |
| Kilmartin | Keogh to Krane | 22 |
| Kilt | Keogh to Krane | 1 |
| Kiltinane | Keogh to Krane | 2 |
| Kilty | Keogh to Krane | 1 |
| Kimmill | Keogh to Krane | 1 |
| Kinahan | Keogh to Krane | 1 |
| Kinaly | Keogh to Krane | 3 |
| Kinane | Keogh to Krane | 1 |
| Kinavan | Keogh to Krane | 1 |
| Kinavane | Keogh to Krane | 9 |
| Kindell | Keogh to Krane | 1 |
| Kinealy | Keogh to Krane | 1 |
| Kinelly | Keogh to Krane | 1 |
| Kinely | Keogh to Krane | 1 |
| Kinevane | Keogh to Krane | 1 |
| King | Keogh to Krane | 47 |
| Kiniery | Keogh to Krane | 1 |
| Kinivane | Keogh to Krane | 2 |
| Kinna | Keogh to Krane | 1 |
| Kinnan | Keogh to Krane | 2 |
| Kinnane | Keogh to Krane | 24 |
| Kinnare | Keogh to Krane | 4 |
| Kinnares | Keogh to Krane | 1 |
| Kinnavane | Keogh to Krane | 1 |
| Kinneally | Keogh to Krane | 4 |
| Kinnealy | Keogh to Krane | 8 |
| Kinnear | Keogh to Krane | 1 |
| Kinneily | Keogh to Krane | 1 |
| Kinnelly | Keogh to Krane | 3 |
| Kinnerk | Keogh to Krane | 1 |
| Kinnerney | Keogh to Krane | 1 |
| Kinnevane | Keogh to Krane | 1 |
| Kinniry | Keogh to Krane | 1 |
| Kinnivane | Keogh to Krane | 1 |
| Kinnucan | Keogh to Krane | 1 |
| Kinnucane | Keogh to Krane | 1 |
| Kinsley | Keogh to Krane | 4 |
| Kinucane | Keogh to Krane | 2 |
| Kirane | Keogh to Krane | 1 |
| Kirby | Keogh to Krane | 9 |
| Kirkshaw | Keogh to Krane | 2 |
| Kirwan | Keogh to Krane | 18 |
| Kirwin | Keogh to Krane | 2 |
| Kishane | Keogh to Krane | 2 |
| Kissane | Keogh to Krane | 1 |
| Kitchen | Keogh to Krane | 5 |
| Kitchon | Keogh to Krane | 1 |
| Kitson | Keogh to Krane | 5 |
| Kittson | Keogh to Krane | 2 |
| Knane | Keogh to Krane | 8 |
| Knoulty | Keogh to Krane | 1 |
| Knowl | Keogh to Krane | 1 |
| Knox | Keogh to Krane | 5 |
| Krane | Keogh to Krane | 3 |
| Lacey | Lacey to Leyne | 1 |
| Lacy | Lacey to Leyne | 14 |
| Ladder | Lacey to Leyne | 1 |
| Laferty | Lacey to Leyne | 4 |
| Lafferty | Lacey to Leyne | 6 |
| Lahiff | Lacey to Leyne | 10 |
| Lahiffe | Lacey to Leyne | 7 |
| Lahive | Lacey to Leyne | 7 |
| Lahy | Lacey to Leyne | 1 |
| Lallie | Lacey to Leyne | 2 |
| Lally | Lacey to Leyne | 2 |
| Lalor | Lacey to Leyne | 7 |
| Lambert | Lacey to Leyne | 3 |
| Landers | Lacey to Leyne | 12 |
| Lane | Lacey to Leyne | 9 |
| Langan | Lacey to Leyne | 4 |
| Langford | Lacey to Leyne | 1 |
| Lanheady | Lacey to Leyne | 1 |
| Lannan | Lacey to Leyne | 4 |
| Lardner | Lacey to Leyne | 7 |
| Larkin | Lacey to Leyne | 37 |
| Law | Lacey to Leyne | 22 |
| Lawler | Lacey to Leyne | 10 |
| Lawless | Lacey to Leyne | 1 |
| Lawlor | Lacey to Leyne | 2 |
| Lawney | Lacey to Leyne | 1 |
| Lawson | Lacey to Leyne | 3 |
| Layden | Lacey to Leyne | 4 |
| Leader | Lacey to Leyne | 4 |
| Leadon | Lacey to Leyne | 3 |
| Leahan | Lacey to Leyne | 1 |
| Leahy | Lacey to Leyne | 19 |
| Leamy | Lacey to Leyne | 2 |
| Lean | Lacey to Leyne | 5 |
| Learhinan | Lacey to Leyne | 4 |
| Leary | Lacey to Leyne | 77 |
| Leddane | Lacey to Leyne | 2 |
| Leddin | Lacey to Leyne | 1 |
| Leddy | Lacey to Leyne | 4 |
| Leden | Lacey to Leyne | 1 |
| Lee | Lacey to Leyne | 22 |
| Leech | Lacey to Leyne | 2 |
| Leeson | Lacey to Leyne | 2 |
| Lehy | Lacey to Leyne | 2 |
| Lellis | Lacey to Leyne | 1 |
| Lenahan | Lacey to Leyne | 1 |
| Lenane | Lacey to Leyne | 6 |
| Lenehan | Lacey to Leyne | 2 |
| Leney | Lacey to Leyne | 1 |
| Lenihan | Lacey to Leyne | 6 |
| Lennan | Lacey to Leyne | 3 |
| Lennane | Lacey to Leyne | 6 |
| Lennon | Lacey to Leyne | 8 |
| Leo | Lacey to Leyne | 9 |
| Leonard | Lacey to Leyne | 32 |
| Leopard | Lacey to Leyne | 1 |
| Lepard | Lacey to Leyne | 1 |
| Lernan | Lacey to Leyne | 13 |
| Lernihan | Lacey to Leyne | 1 |
| Levers | Lacey to Leyne | 1 |
| Lewin | Lacey to Leyne | 1 |
| Lewis | Lacey to Leyne | 5 |
| Leydan | Lacey to Leyne | 6 |
| Leyden | Lacey to Leyne | 21 |
| Leydin | Lacey to Leyne | 5 |
| Leyne | Lacey to Leyne | 1 |
| Liddane | Liddane to Lunneen | 16 |
| Liddy | Liddane to Lunneen | 60 |
| Lightly | Liddane to Lunneen | 1 |
| Lillis | Liddane to Lunneen | 66 |
| Lime | Liddane to Lunneen | 1 |
| Limerick | Liddane to Lunneen | 5 |
| Linchy | Liddane to Lunneen | 1 |
| Lindsay | Liddane to Lunneen | 1 |
| Lindsey | Liddane to Lunneen | 1 |
| Linehan | Liddane to Lunneen | 5 |
| Lingard | Liddane to Lunneen | 8 |
| Linnane | Liddane to Lunneen | 43 |
| Listin | Liddane to Lunneen | 1 |
| Listing | Liddane to Lunneen | 1 |
| Liston | Liddane to Lunneen | 2 |
| Little | Liddane to Lunneen | 2 |
| Littleton | Liddane to Lunneen | 13 |
| Lloyd | Liddane to Lunneen | 8 |
| Locke | Liddane to Lunneen | 1 |
| Lockyer | Liddane to Lunneen | 1 |
| Lodor | Liddane to Lunneen | 1 |
| Loftus | Liddane to Lunneen | 6 |
| Logan | Liddane to Lunneen | 4 |
| Lomas | Liddane to Lunneen | 1 |
| Lombard | Liddane to Lunneen | 1 |
| Lonergan | Liddane to Lunneen | 3 |
| Long | Liddane to Lunneen | 20 |
| Longan | Liddane to Lunneen | 1 |
| Longing | Liddane to Lunneen | 2 |
| Looney | Liddane to Lunneen | 20 |
| Loony | Liddane to Lunneen | 1 |
| Lopdell | Liddane to Lunneen | 4 |
| Loregan | Liddane to Lunneen | 2 |
| Lorigan | Liddane to Lunneen | 6 |
| Lorrigan | Liddane to Lunneen | 1 |
| Lott | Liddane to Lunneen | 1 |
| Lotus | Liddane to Lunneen | 1 |
| Loughery | Liddane to Lunneen | 6 |
| Loughlan | Liddane to Lunneen | 2 |
| Loughlin | Liddane to Lunneen | 15 |
| Loughman | Liddane to Lunneen | 1 |
| Loughnan | Liddane to Lunneen | 3 |
| Loughnane | Liddane to Lunneen | 5 |
| Loughrey | Liddane to Lunneen | 3 |
| Loughry | Liddane to Lunneen | 8 |
| Louney | Liddane to Lunneen | 7 |
| Louny | Liddane to Lunneen | 2 |
| Lourie | Liddane to Lunneen | 1 |
| Lourigan | Liddane to Lunneen | 1 |
| Lowe | Liddane to Lunneen | 1 |
| Lowrie | Liddane to Lunneen | 1 |
| Lowry | Liddane to Lunneen | 2 |
| Lucas | Liddane to Lunneen | 24 |
| Lucy | Liddane to Lunneen | 2 |
| Lune | Liddane to Lunneen | 1 |
| Lunnane | Liddane to Lunneen | 1 |
| Lunneen | Liddane to Lunneen | 3 |
| Lyddy | Lyddy to Lyttleton | 4 |
| Lynam | Lyddy to Lyttleton | 1 |
| Lynan | Lyddy to Lyttleton | 2 |
| Lynch | Lyddy to Lyttleton | 274 |
| Lyne | Lyddy to Lyttleton | 1 |
| Lynn | Lyddy to Lyttleton | 1 |
| Lynnane | Lyddy to Lyttleton | 1 |
| Lyons | Lyddy to Lyttleton | 57 |
| Lysaght | Lyddy to Lyttleton | 67 |
| Lyttleton | Lyddy to Lyttleton | 3 |
| MacBeth | MacBeth to Mallon | 8 |
| Mack | MacBeth to Mallon | 21 |
| Mackay | MacBeth to Mallon | 1 |
| Mackeen | MacBeth to Mallon | 4 |
| Macken | MacBeth to Mallon | 3 |
| Mackey | MacBeth to Mallon | 17 |
| Mackle | MacBeth to Mallon | 1 |
| Macklin | MacBeth to Mallon | 1 |
| Macnay | MacBeth to Mallon | 2 |
| Madden | MacBeth to Mallon | 59 |
| Maddigan | MacBeth to Mallon | 3 |
| Madigan | MacBeth to Mallon | 92 |
| Magan | MacBeth to Mallon | 1 |
| Magann | MacBeth to Mallon | 2 |
| Magee | MacBeth to Mallon | 3 |
| Magner | MacBeth to Mallon | 10 |
| Magrath | MacBeth to Mallon | 36 |
| Maguane | MacBeth to Mallon | 2 |
| Maguire | MacBeth to Mallon | 17 |
| Maher | MacBeth to Mallon | 35 |
| Mahon | MacBeth to Mallon | 52 |
| Mahony | MacBeth to Mallon | 77 |
| Maily | MacBeth to Mallon | 4 |
| Mainy | MacBeth to Mallon | 1 |
| Mair | MacBeth to Mallon | 1 |
| Mairian | MacBeth to Mallon | 1 |
| Malachy | MacBeth to Mallon | 1 |
| Malborough | MacBeth to Mallon | 2 |
| Malcolm | MacBeth to Mallon | 4 |
| Mallard | MacBeth to Mallon | 1 |
| Malley | MacBeth to Mallon | 27 |
| Mallon | MacBeth to Mallon | 2 |
| Malone | Malone to Martin | 147 |
| Maloney | Malone to Martin | 18 |
| Malony | Malone to Martin | 86 |
| Malowny | Malone to Martin | 1 |
| Malwheeny | Malone to Martin | 1 |
| Manderson | Malone to Martin | 1 |
| Manett | Malone to Martin | 1 |
| Maney | Malone to Martin | 1 |
| Mangan | Malone to Martin | 24 |
| Mangane | Malone to Martin | 3 |
| Maninen | Malone to Martin | 2 |
| Manix | Malone to Martin | 1 |
| Mann | Malone to Martin | 6 |
| Mannick | Malone to Martin | 1 |
| Manning | Malone to Martin | 6 |
| Mannion | Malone to Martin | 4 |
| Mannix | Malone to Martin | 7 |
| Manoge | Malone to Martin | 2 |
| Mantle | Malone to Martin | 4 |
| Maqueeny | Malone to Martin | 1 |
| Mara | Malone to Martin | 15 |
| Maranan | Malone to Martin | 2 |
| Marcolm | Malone to Martin | 1 |
| Marcom | Malone to Martin | 3 |
| Marcum | Malone to Martin | 4 |
| Marigall | Malone to Martin | 3 |
| Marinan | Malone to Martin | 23 |
| Marinen | Malone to Martin | 5 |
| Markaham | Malone to Martin | 4 |
| Markam | Malone to Martin | 1 |
| Markey | Malone to Martin | 3 |
| Markham | Malone to Martin | 43 |
| Markihen | Malone to Martin | 2 |
| Markum | Malone to Martin | 1 |
| Marlboro | Malone to Martin | 1 |
| Marlborough | Malone to Martin | 1 |
| Marman | Malone to Martin | 3 |
| Marnane | Malone to Martin | 3 |
| Marnon | Malone to Martin | 13 |
| Maron | Malone to Martin | 1 |
| Maroney | Malone to Martin | 2 |
| Marony | Malone to Martin | 8 |
| Marrett | Malone to Martin | 1 |
| Marrinan | Malone to Martin | 12 |
| Marrinane | Malone to Martin | 3 |
| Marrinen | Malone to Martin | 6 |
| Marsh | Malone to Martin | 5 |
| Marshall | Malone to Martin | 1 |
| Martin | Malone to Martin | 43 |
| Mason | Mason to McFairland | 10 |
| Massy | Mason to McFairland | 48 |
| Matheson | Mason to McFairland | 1 |
| Mathews | Mason to McFairland | 1 |
| Maunsell | Mason to McFairland | 5 |
| Mayd | Mason to McFairland | 1 |
| Mayne | Mason to McFairland | 7 |
| McAdam | Mason to McFairland | 11 |
| McAdams | Mason to McFairland | 1 |
| McAllen | Mason to McFairland | 7 |
| McAllin | Mason to McFairland | 6 |
| McAnerney | Mason to McFairland | 2 |
| McAnerny | Mason to McFairland | 1 |
| McArthur | Mason to McFairland | 1 |
| McAuliffe | Mason to McFairland | 23 |
| McCabe | Mason to McFairland | 2 |
| McCann | Mason to McFairland | 2 |
| McCanty | Mason to McFairland | 1 |
| McCarthy | Mason to McFairland | 84 |
| McCarty | Mason to McFairland | 3 |
| McCaul | Mason to McFairland | 2 |
| McCaw | Mason to McFairland | 3 |
| McCawe | Mason to McFairland | 1 |
| McClelland | Mason to McFairland | 2 |
| McCluskey | Mason to McFairland | 1 |
| McConoghty | Mason to McFairland | 1 |
| McConry | Mason to McFairland | 2 |
| McCormack | Mason to McFairland | 37 |
| McCormick | Mason to McFairland | 14 |
| McCowan | Mason to McFairland | 1 |
| McCraith | Mason to McFairland | 5 |
| McCue | Mason to McFairland | 4 |
| McCullinan | Mason to McFairland | 2 |
| McDermott | Mason to McFairland | 20 |
| McDonagh | Mason to McFairland | 25 |
| McDonald | Mason to McFairland | 2 |
| McDonnell | Mason to McFairland | 105 |
| McDonogh | Mason to McFairland | 30 |
| McDonough | Mason to McFairland | 2 |
| McDowell | Mason to McFairland | 1 |
| McEnerney | Mason to McFairland | 8 |
| McEnerny | Mason to McFairland | 1 |
| McEnertney | Mason to McFairland | 1 |
| McEnertny | Mason to McFairland | 1 |
| McEnery | Mason to McFairland | 2 |
| McEniry | Mason to McFairland | 1 |
| McErney | Mason to McFairland | 1 |
| McEvoy | Mason to McFairland | 2 |
| McFairland | Mason to McFairland | 1 |
| McGan | McGan to McInerny | 6 |
| McGann | McGan to McInerny | 25 |
| McGannon | McGan to McInerny | 7 |
| McGee | McGan to McInerny | 1 |
| McGivan | McGan to McInerny | 1 |
| McGlashy | McGan to McInerny | 1 |
| McGlasky | McGan to McInerny | 1 |
| McGonickle | McGan to McInerny | 1 |
| McGowan | McGan to McInerny | 10 |
| McGrath | McGan to McInerny | 153 |
| McGreggor | McGan to McInerny | 1 |
| McGregor | McGan to McInerny | 1 |
| McGrin | McGan to McInerny | 3 |
| McGuan | McGan to McInerny | 4 |
| McGuane | McGan to McInerny | 32 |
| McGuin | McGan to McInerny | 1 |
| McGuinness | McGan to McInerny | 9 |
| McGuire | McGan to McInerny | 13 |
| McGwan | McGan to McInerny | 2 |
| McGwann | McGan to McInerny | 1 |
| McHugh | McGan to McInerny | 2 |
| McIneiry | McGan to McInerny | 4 |
| McInerhy | McGan to McInerny | 6 |
| McInerney | McGan to McInerny | 222 |
| McInerny | McGan to McInerny | 114 |
| McInertney | McInertney to McMahon, (Maurice) | 2 |
| McInery | McInertney to McMahon, (Maurice) | 6 |
| McIniery | McInertney to McMahon, (Maurice) | 1 |
| McInnerney | McInertney to McMahon, (Maurice) | 1 |
| McIvers | McInertney to McMahon, (Maurice) | 1 |
| McKay | McInertney to McMahon, (Maurice) | 3 |
| McKean | McInertney to McMahon, (Maurice) | 3 |
| McKeane | McInertney to McMahon, (Maurice) | 1 |
| McKee | McInertney to McMahon, (Maurice) | 6 |
| McKeen | McInertney to McMahon, (Maurice) | 1 |
| McKenna | McInertney to McMahon, (Maurice) | 4 |
| McKenzie | McInertney to McMahon, (Maurice) | 1 |
| McKeogh | McInertney to McMahon, (Maurice) | 4 |
| McKeon | McInertney to McMahon, (Maurice) | 4 |
| McKeough | McInertney to McMahon, (Maurice) | 16 |
| McKerns | McInertney to McMahon, (Maurice) | 1 |
| McKew | McInertney to McMahon, (Maurice) | 1 |
| McKnight | McInertney to McMahon, (Maurice) | 7 |
| McKnoulty | McInertney to McMahon, (Maurice) | 2 |
| McLoughlin | McInertney to McMahon, (Maurice) | 1 |
| McMahon | McInertney to McMahon, (Maurice) | 855 |
| McMahon, (Michael) to McNally |
| McManus | McMahon, (Michael) to McNally | 1 |
| McMara | McMahon, (Michael) to McNally | 2 |
| McMillan | McMahon, (Michael) to McNally | 1 |
| McNally | McMahon, (Michael) to McNally | 3 |
| McNamara | McNamara, (Andrew) to McNamara, (Maurice) | 847 |
| McNamara, (Michael) to Meany |
| McNamee | McNamara, (Michael) to Meany | 1 |
| McNerny | McNamara, (Michael) to Meany | 2 |
| McNertney | McNamara, (Michael) to Meany | 4 |
| McNertny | McNamara, (Michael) to Meany | 2 |
| McNevin | McNamara, (Michael) to Meany | 2 |
| McNight | McNamara, (Michael) to Meany | 2 |
| McNulty | McNamara, (Michael) to Meany | 1 |
| McOwen | McNamara, (Michael) to Meany | 1 |
| McQueeny | McNamara, (Michael) to Meany | 1 |
| McQuilan | McNamara, (Michael) to Meany | 2 |
| McQuillan | McNamara, (Michael) to Meany | 1 |
| McTague | McNamara, (Michael) to Meany | 2 |
| McTeigue | McNamara, (Michael) to Meany | 2 |
| McTige | McNamara, (Michael) to Meany | 2 |
| McTighe | McNamara, (Michael) to Meany | 6 |
| McTigue | McNamara, (Michael) to Meany | 3 |
| McVeagh | McNamara, (Michael) to Meany | 1 |
| McWalter | McNamara, (Michael) to Meany | 1 |
| Mead | McNamara, (Michael) to Meany | 7 |
| Meade | McNamara, (Michael) to Meany | 50 |
| Meagher | McNamara, (Michael) to Meany | 2 |
| Mealahan | McNamara, (Michael) to Meany | 1 |
| Mealey | McNamara, (Michael) to Meany | 4 |
| Mealy | McNamara, (Michael) to Meany | 9 |
| Meaney | McNamara, (Michael) to Meany | 6 |
| Meany | McNamara, (Michael) to Meany | 51 |
| Mear | Mear to Moloney, (Honoria) | 2 |
| Meara | Mear to Moloney, (Honoria) | 12 |
| Meard | Mear to Moloney, (Honoria) | 1 |
| Meares | Mear to Moloney, (Honoria) | 1 |
| Mears | Mear to Moloney, (Honoria) | 2 |
| Mede | Mear to Moloney, (Honoria) | 1 |
| Mee | Mear to Moloney, (Honoria) | 6 |
| Meehan | Mear to Moloney, (Honoria) | 75 |
| Meeher | Mear to Moloney, (Honoria) | 3 |
| Meehon | Mear to Moloney, (Honoria) | 1 |
| Meenahan | Mear to Moloney, (Honoria) | 1 |
| Meer | Mear to Moloney, (Honoria) | 39 |
| Meere | Mear to Moloney, (Honoria) | 12 |
| Melehan | Mear to Moloney, (Honoria) | 3 |
| Melephant | Mear to Moloney, (Honoria) | 1 |
| Melia | Mear to Moloney, (Honoria) | 1 |
| Melican | Mear to Moloney, (Honoria) | 10 |
| Melihan | Mear to Moloney, (Honoria) | 1 |
| Mellican | Mear to Moloney, (Honoria) | 1 |
| Melody | Mear to Moloney, (Honoria) | 4 |
| Melville | Mear to Moloney, (Honoria) | 1 |
| Mengane | Mear to Moloney, (Honoria) | 1 |
| Menton | Mear to Moloney, (Honoria) | 2 |
| Menzie | Mear to Moloney, (Honoria) | 2 |
| Menzies | Mear to Moloney, (Honoria) | 1 |
| Merrinan | Mear to Moloney, (Honoria) | 2 |
| Merritt | Mear to Moloney, (Honoria) | 4 |
| Merrott | Mear to Moloney, (Honoria) | 2 |
| Mescal | Mear to Moloney, (Honoria) | 1 |
| Mescall | Mear to Moloney, (Honoria) | 26 |
| Mescell | Mear to Moloney, (Honoria) | 7 |
| Meschal | Mear to Moloney, (Honoria) | 1 |
| Mesckal | Mear to Moloney, (Honoria) | 2 |
| Meskil | Mear to Moloney, (Honoria) | 2 |
| Meskill | Mear to Moloney, (Honoria) | 9 |
| Meyler | Mear to Moloney, (Honoria) | 1 |
| Mien | Mear to Moloney, (Honoria) | 1 |
| Milan | Mear to Moloney, (Honoria) | 1 |
| Milican | Mear to Moloney, (Honoria) | 4 |
| Miligan | Mear to Moloney, (Honoria) | 1 |
| Millaan | Mear to Moloney, (Honoria) | 6 |
| Miller | Mear to Moloney, (Honoria) | 11 |
| Millican | Mear to Moloney, (Honoria) | 2 |
| Milliken | Mear to Moloney, (Honoria) | 2 |
| Mills | Mear to Moloney, (Honoria) | 1 |
| Milward | Mear to Moloney, (Honoria) | 6 |
| Minahan | Mear to Moloney, (Honoria) | 10 |
| Minane | Mear to Moloney, (Honoria) | 4 |
| Minature | Mear to Moloney, (Honoria) | 1 |
| Minchan | Mear to Moloney, (Honoria) | 1 |
| Minchin | Mear to Moloney, (Honoria) | 2 |
| Minehan | Mear to Moloney, (Honoria) | 8 |
| Mingane | Mear to Moloney, (Honoria) | 1 |
| Minihan | Mear to Moloney, (Honoria) | 2 |
| Miniter | Mear to Moloney, (Honoria) | 11 |
| Minnane | Mear to Moloney, (Honoria) | 2 |
| Minniter | Mear to Moloney, (Honoria) | 1 |
| Minnogue | Mear to Moloney, (Honoria) | 7 |
| Minoge | Mear to Moloney, (Honoria) | 3 |
| Minogue | Mear to Moloney, (Honoria) | 78 |
| Mires | Mear to Moloney, (Honoria) | 2 |
| Miskill | Mear to Moloney, (Honoria) | 1 |
| Mitchel | Mear to Moloney, (Honoria) | 1 |
| Mitchell | Mear to Moloney, (Honoria) | 6 |
| Moirtey | Mear to Moloney, (Honoria) | 1 |
| Mollohan | Mear to Moloney, (Honoria) | 2 |
| Molloy | Mear to Moloney, (Honoria) | 20 |
| Moloney | Mear to Moloney, (Honoria) | 313 |
| Moloney, (Hugh) to Mongivan |
| Molony | Moloney, (Hugh) to Mongivan | 245 |
| Molunny | Moloney, (Hugh) to Mongivan | 2 |
| Monaghan | Moloney, (Hugh) to Mongivan | 6 |
| Monahan | Moloney, (Hugh) to Mongivan | 5 |
| Monahan, Jnr | Moloney, (Hugh) to Mongivan | 1 |
| Mongavan | Moloney, (Hugh) to Mongivan | 2 |
| Mongevan | Moloney, (Hugh) to Mongivan | 1 |
| Mongivan | Moloney, (Hugh) to Mongivan | 1 |
| Mongovan | Moloney, (Hugh) to Mongivan | 7 |
| Monsell | Monsell to Moylans | 4 |
| Monserge | Monsell to Moylans | 1 |
| Monten | Monsell to Moylans | 1 |
| Montgomery | Monsell to Moylans | 1 |
| Moody | Monsell to Moylans | 4 |
| Mooney | Monsell to Moylans | 21 |
| Moore | Monsell to Moylans | 23 |
| Moran | Monsell to Moylans | 72 |
| Moray | Monsell to Moylans | 1 |
| Morcahan | Monsell to Moylans | 1 |
| Morgan | Monsell to Moylans | 30 |
| Moriarty | Monsell to Moylans | 4 |
| Morissy | Monsell to Moylans | 1 |
| Morland | Monsell to Moylans | 8 |
| Morley | Monsell to Moylans | 1 |
| Mornane | Monsell to Moylans | 3 |
| Moroney | Monsell to Moylans | 104 |
| Morony | Monsell to Moylans | 112 |
| Morris | Monsell to Moylans | 16 |
| Morrissey | Monsell to Moylans | 20 |
| Morrissy | Monsell to Moylans | 36 |
| Moss | Monsell to Moylans | 1 |
| Moy | Monsell to Moylans | 1 |
| Moylan | Monsell to Moylans | 42 |
| Moylans | Monsell to Moylans | 1 |
| Moynahan | Moynahan to Myles | 2 |
| Moynehan | Moynahan to Myles | 2 |
| Mugavan | Moynahan to Myles | 2 |
| Muggavin | Moynahan to Myles | 1 |
| Muggevan | Moynahan to Myles | 1 |
| Muggevin | Moynahan to Myles | 16 |
| Muggiven | Moynahan to Myles | 1 |
| Mulally | Moynahan to Myles | 1 |
| Mulcahy | Moynahan to Myles | 15 |
| Mulconrey | Moynahan to Myles | 1 |
| Mulconry | Moynahan to Myles | 13 |
| Mulcreevy | Moynahan to Myles | 3 |
| Mulcunry | Moynahan to Myles | 2 |
| Mulgannon | Moynahan to Myles | 1 |
| Mulheen | Moynahan to Myles | 1 |
| Mulholland | Moynahan to Myles | 1 |
| Mulkeeny | Moynahan to Myles | 1 |
| Mullaghan | Moynahan to Myles | 1 |
| Mullahan | Moynahan to Myles | 1 |
| Mullampy | Moynahan to Myles | 1 |
| Mullane | Moynahan to Myles | 3 |
| Mullarchy | Moynahan to Myles | 1 |
| Mullen | Moynahan to Myles | 3 |
| Mullens | Moynahan to Myles | 2 |
| Mulligan | Moynahan to Myles | 2 |
| Mullin | Moynahan to Myles | 2 |
| Mullins | Moynahan to Myles | 66 |
| Mulloon | Moynahan to Myles | 1 |
| Mullowney | Moynahan to Myles | 10 |
| Mullunny | Moynahan to Myles | 1 |
| Mullville | Moynahan to Myles | 2 |
| Mulqueen | Moynahan to Myles | 6 |
| Mulqueeny | Moynahan to Myles | 22 |
| Mulquinny | Moynahan to Myles | 18 |
| Mulquiny | Moynahan to Myles | 1 |
| Mulready | Moynahan to Myles | 3 |
| Mulreedy | Moynahan to Myles | 1 |
| Mulroney | Moynahan to Myles | 1 |
| Mulvale | Moynahan to Myles | 1 |
| Mulvehil | Moynahan to Myles | 1 |
| Mulvichael | Moynahan to Myles | 1 |
| Mulvihil | Moynahan to Myles | 1 |
| Mulvihill | Moynahan to Myles | 22 |
| Mulville | Moynahan to Myles | 3 |
| Mulvohil | Moynahan to Myles | 1 |
| Mulvohill | Moynahan to Myles | 1 |
| Mungavan | Moynahan to Myles | 3 |
| Mungavin | Moynahan to Myles | 2 |
| Mungevan | Moynahan to Myles | 1 |
| Mungivan | Moynahan to Myles | 2 |
| Mungovan | Moynahan to Myles | 22 |
| Mungovin | Moynahan to Myles | 1 |
| Muraghy | Moynahan to Myles | 2 |
| Murdock | Moynahan to Myles | 4 |
| Murihy | Moynahan to Myles | 1 |
| Murnane | Moynahan to Myles | 2 |
| Murony | Moynahan to Myles | 1 |
| Murphy | Moynahan to Myles | 214 |
| Murraghy | Moynahan to Myles | 1 |
| Murrahy | Moynahan to Myles | 4 |
| Murrane | Moynahan to Myles | 3 |
| Murray | Moynahan to Myles | 53 |
| Murrihy | Moynahan to Myles | 26 |
| Murrin | Moynahan to Myles | 1 |
| Murta | Moynahan to Myles | 1 |
| Murtagh | Moynahan to Myles | 2 |
| Murtough | Moynahan to Myles | 3 |
| Muzway | Moynahan to Myles | 1 |
| Mye | Moynahan to Myles | 1 |
| Myles | Moynahan to Myles | 1 |
| Nagle | Nagle to Newton | 35 |
| Nailan | Nagle to Newton | 3 |
| Nailon | Nagle to Newton | 1 |
| Nash | Nagle to Newton | 36 |
| Naughtan | Nagle to Newton | 1 |
| Naughten | Nagle to Newton | 16 |
| Naughton | Nagle to Newton | 19 |
| Navin | Nagle to Newton | 1 |
| Naylon | Nagle to Newton | 1 |
| Neagle | Nagle to Newton | 19 |
| Neal | Nagle to Newton | 2 |
| Nealon | Nagle to Newton | 25 |
| Nee | Nagle to Newton | 2 |
| Neenan | Nagle to Newton | 12 |
| Nehill | Nagle to Newton | 1 |
| Neil | Nagle to Newton | 1 |
| Neilan | Nagle to Newton | 10 |
| Neill | Nagle to Newton | 31 |
| Nelan | Nagle to Newton | 8 |
| Neland | Nagle to Newton | 1 |
| Nelligan | Nagle to Newton | 3 |
| Nelly | Nagle to Newton | 1 |
| Nelson | Nagle to Newton | 15 |
| Nester | Nagle to Newton | 7 |
| Nestor | Nagle to Newton | 21 |
| Neville | Nagle to Newton | 31 |
| Nevin | Nagle to Newton | 2 |
| Newport | Nagle to Newton | 1 |
| Newton | Nagle to Newton | 1 |
| Neylan | Neylan to Nunan | 82 |
| Neyland | Neylan to Nunan | 1 |
| Neylen | Neylan to Nunan | 3 |
| Neylon | Neylan to Nunan | 24 |
| Nihil | Neylan to Nunan | 11 |
| Nihill | Neylan to Nunan | 55 |
| Nilan | Neylan to Nunan | 6 |
| Nix | Neylan to Nunan | 6 |
| Nixon | Neylan to Nunan | 12 |
| Noctin | Neylan to Nunan | 1 |
| Nolan | Neylan to Nunan | 22 |
| Noonan | Neylan to Nunan | 37 |
| Noone | Neylan to Nunan | 3 |
| Norbury | Neylan to Nunan | 12 |
| Normile | Neylan to Nunan | 28 |
| Normoyle | Neylan to Nunan | 1 |
| Normyle | Neylan to Nunan | 2 |
| Norton | Neylan to Nunan | 2 |
| Nowlan | Neylan to Nunan | 2 |
| Nugent | Neylan to Nunan | 23 |
| Nunan | Neylan to Nunan | 2 |
| O'Brien | O'Brien (Anne) to O'Brien, (Myles) | 685 |
| O'Brien, (Patrick) to O'Dea, (John) |
| O'Brine | O'Brien, (Patrick) to O'Dea, (John) | 1 |
| O'Callaghan | O'Brien, (Patrick) to O'Dea, (John) | 56 |
| O'Connell | O'Brien, (Patrick) to O'Dea, (John) | 35 |
| O'Conner | O'Brien, (Patrick) to O'Dea, (John) | 1 |
| O'Connor | O'Brien, (Patrick) to O'Dea, (John) | 116 |
| O'Connors | O'Brien, (Patrick) to O'Dea, (John) | 2 |
| O'Dea | O'Brien, (Patrick) to O'Dea, (John) | 174 |
| O'Dea, (Joseph) to O'Kelly |
| O'Dell | O'Dea, (Joseph) to O'Kelly | 1 |
| O'Donnell | O'Dea, (Joseph) to O'Kelly | 144 |
| O'Donohoe | O'Dea, (Joseph) to O'Kelly | 13 |
| O'Driscoll | O'Dea, (Joseph) to O'Kelly | 7 |
| O'Dwyer | O'Dea, (Joseph) to O'Kelly | 57 |
| O'Fea | O'Dea, (Joseph) to O'Kelly | 1 |
| O'Flanagan | O'Dea, (Joseph) to O'Kelly | 1 |
| O'Flanigan | O'Dea, (Joseph) to O'Kelly | 1 |
| O'Gorman | O'Dea, (Joseph) to O'Kelly | 48 |
| O'Grady | O'Dea, (Joseph) to O'Kelly | 29 |
| O'Halloran | O'Dea, (Joseph) to O'Kelly | 20 |
| O'Hara | O'Dea, (Joseph) to O'Kelly | 8 |
| O'Heara | O'Dea, (Joseph) to O'Kelly | 1 |
| O'Kearney | O'Dea, (Joseph) to O'Kelly | 1 |
| O'Keeffe | O'Dea, (Joseph) to O'Kelly | 51 |
| O'Kelly | O'Dea, (Joseph) to O'Kelly | 2 |
| O'Leary | O'Leary to Owens | 4 |
| O'Loghlen | O'Leary to Owens | 19 |
| O'Loghlin | O'Leary to Owens | 8 |
| O'Loughlin | O'Leary to Owens | 208 |
| O'Malley | O'Leary to Owens | 2 |
| O'Mally | O'Leary to Owens | 2 |
| O'Mara | O'Leary to Owens | 4 |
| O'Meally | O'Leary to Owens | 2 |
| O'Meara | O'Leary to Owens | 10 |
| O'Neal | O'Leary to Owens | 1 |
| O'Neil | O'Leary to Owens | 5 |
| O'Neill | O'Leary to Owens | 129 |
| O'Neille | O'Leary to Owens | 1 |
| O'Regan | O'Leary to Owens | 6 |
| O'Reilly | O'Leary to Owens | 13 |
| O'Reily | O'Leary to Owens | 1 |
| O'Rourke | O'Leary to Owens | 6 |
| O'Shaughnessy | O'Leary to Owens | 8 |
| O'Shea | O'Leary to Owens | 2 |
| O'Sullivan | O'Leary to Owens | 2 |
| Odlum | O'Leary to Owens | 1 |
| Organ | O'Leary to Owens | 10 |
| Organson | O'Leary to Owens | 1 |
| Ormonde | O'Leary to Owens | 2 |
| Owen | O'Leary to Owens | 1 |
| Owens | O'Leary to Owens | 5 |
| Parnell | "P" Surnames | 2 |
| Parry | "P" Surnames | 1 |
| Parsons | "P" Surnames | 3 |
| Partridge | "P" Surnames | 1 |
| Patterson | "P" Surnames | 18 |
| Payne | "P" Surnames | 3 |
| Peacock | "P" Surnames | 13 |
| Pelkington | "P" Surnames | 1 |
| Pendar | "P" Surnames | 1 |
| Pender | "P" Surnames | 16 |
| Pendergast | "P" Surnames | 1 |
| Penn | "P" Surnames | 1 |
| Peppard | "P" Surnames | 4 |
| Pepper | "P" Surnames | 7 |
| Pequin | "P" Surnames | 1 |
| Perril | "P" Surnames | 1 |
| Perry | "P" Surnames | 3 |
| Perryman | "P" Surnames | 2 |
| Persse | "P" Surnames | 2 |
| Peters | "P" Surnames | 1 |
| Peterson | "P" Surnames | 1 |
| Petty | "P" Surnames | 4 |
| Pewter | "P" Surnames | 1 |
| Phayre | "P" Surnames | 1 |
| Philips | "P" Surnames | 5 |
| Phillips | "P" Surnames | 1 |
| Pickford | "P" Surnames | 1 |
| Pierce | "P" Surnames | 17 |
| Piercey | "P" Surnames | 1 |
| Pierse | "P" Surnames | 2 |
| Pierson | "P" Surnames | 1 |
| Pigott | "P" Surnames | 1 |
| Pilkington | "P" Surnames | 28 |
| Pilow | "P" Surnames | 1 |
| Pinder | "P" Surnames | 7 |
| Pine | "P" Surnames | 7 |
| Pinn | "P" Surnames | 1 |
| Piper | "P" Surnames | 1 |
| Pitcairn | "P" Surnames | 1 |
| Plant | "P" Surnames | 1 |
| Plunkett | "P" Surnames | 5 |
| Pocklington | "P" Surnames | 6 |
| Poclington | "P" Surnames | 1 |
| Pole | "P" Surnames | 3 |
| Pollens | "P" Surnames | 1 |
| Potter | "P" Surnames | 3 |
| Potts | "P" Surnames | 1 |
| Powell | "P" Surnames | 24 |
| Power | "P" Surnames | 51 |
| Prendergast | "P" Surnames | 9 |
| Prenty | "P" Surnames | 1 |
| Preston | "P" Surnames | 1 |
| Prevelle | "P" Surnames | 1 |
| Price | "P" Surnames | 5 |
| Prosser | "P" Surnames | 1 |
| Puigh | "P" Surnames | 1 |
| Punch | "P" Surnames | 4 |
| Purcell | "P" Surnames | 37 |
| Purdon | "P" Surnames | 25 |
| Purtell | "P" Surnames | 13 |
| Purtil | "P" Surnames | 11 |
| Purtill | "P" Surnames | 6 |
| Purtle | "P" Surnames | 5 |
| Pyne | "P" Surnames | 17 |
| Quaid | "Q" Surnames | 3 |
| Quailly | "Q" Surnames | 4 |
| Quaily | "Q" Surnames | 2 |
| Quain | "Q" Surnames | 3 |
| Quaine | "Q" Surnames | 2 |
| Qualey | "Q" Surnames | 11 |
| Quealy | "Q" Surnames | 33 |
| Quigley | "Q" Surnames | 13 |
| Quigly | "Q" Surnames | 5 |
| Quigney | "Q" Surnames | 4 |
| Quigny | "Q" Surnames | 1 |
| Quiligan | "Q" Surnames | 1 |
| Quilivan | "Q" Surnames | 2 |
| Quillan | "Q" Surnames | 3 |
| Quilligan | "Q" Surnames | 7 |
| Quillinan | "Q" Surnames | 10 |
| Quillinane | "Q" Surnames | 1 |
| Quilnan | "Q" Surnames | 2 |
| Quilty | "Q" Surnames | 6 |
| Quin | "Q" Surnames | 25 |
| Quinlan | "Q" Surnames | 23 |
| Quinlavan | "Q" Surnames | 4 |
| Quinlevin | "Q" Surnames | 1 |
| Quinlivan | "Q" Surnames | 65 |
| Quinlivin | "Q" Surnames | 1 |
| Quinllinan | "Q" Surnames | 2 |
| Quinn | "Q" Surnames | 149 |
| Quirk | "Q" Surnames | 7 |
| Quirke | "Q" Surnames | 6 |
| Rabbit | Rabbit to Ringrove | 3 |
| Rabbitt | Rabbit to Ringrove | 2 |
| Rae | Rabbit to Ringrove | 1 |
| Rahilly | Rabbit to Ringrove | 2 |
| Raleigh | Rabbit to Ringrove | 2 |
| Ramsay | Rabbit to Ringrove | 1 |
| Rea | Rabbit to Ringrove | 2 |
| Read | Rabbit to Ringrove | 14 |
| Readdy | Rabbit to Ringrove | 1 |
| Reade | Rabbit to Ringrove | 3 |
| Ready | Rabbit to Ringrove | 57 |
| Reardon | Rabbit to Ringrove | 7 |
| Reball | Rabbit to Ringrove | 1 |
| Redan | Rabbit to Ringrove | 1 |
| Reddan | Rabbit to Ringrove | 31 |
| Redden | Rabbit to Ringrove | 5 |
| Reddin | Rabbit to Ringrove | 16 |
| Redding | Rabbit to Ringrove | 4 |
| Reddy | Rabbit to Ringrove | 3 |
| Redmayne | Rabbit to Ringrove | 2 |
| Redmond | Rabbit to Ringrove | 2 |
| Reed | Rabbit to Ringrove | 4 |
| Reedy | Rabbit to Ringrove | 1 |
| Reels | Rabbit to Ringrove | 1 |
| Reeves | Rabbit to Ringrove | 10 |
| Regan | Rabbit to Ringrove | 21 |
| Reidey | Rabbit to Ringrove | 4 |
| Reidy | Rabbit to Ringrove | 107 |
| Reiley | Rabbit to Ringrove | 1 |
| Reilly | Rabbit to Ringrove | 23 |
| Renny | Rabbit to Ringrove | 1 |
| Reynolds | Rabbit to Ringrove | 25 |
| Rice | Rabbit to Ringrove | 5 |
| Richards | Rabbit to Ringrove | 23 |
| Rickard | Rabbit to Ringrove | 1 |
| Rickards | Rabbit to Ringrove | 7 |
| Riddler | Rabbit to Ringrove | 1 |
| Rider | Rabbit to Ringrove | 1 |
| Riggs | Rabbit to Ringrove | 1 |
| Riley | Rabbit to Ringrove | 1 |
| Rind | Rabbit to Ringrove | 1 |
| Ring | Rabbit to Ringrove | 1 |
| Ringrose | Rabbit to Ringrove | 7 |
| Ringrove | Rabbit to Ringrove | 1 |
| Rinn | Rinn to Ryall | 11 |
| Riordan | Rinn to Ryall | 6 |
| Riversdale | Rinn to Ryall | 2 |
| Roach | Rinn to Ryall | 24 |
| Robb | Rinn to Ryall | 1 |
| Robbins | Rinn to Ryall | 2 |
| Roberts | Rinn to Ryall | 3 |
| Robertson | Rinn to Ryall | 1 |
| Robins | Rinn to Ryall | 2 |
| Robinson | Rinn to Ryall | 12 |
| Roche | Rinn to Ryall | 76 |
| Rochford | Rinn to Ryall | 34 |
| Rochfort | Rinn to Ryall | 4 |
| Rody | Rinn to Ryall | 1 |
| Roe | Rinn to Ryall | 3 |
| Rogers | Rinn to Ryall | 32 |
| Rohan | Rinn to Ryall | 3 |
| Roland | Rinn to Ryall | 2 |
| Rollin | Rinn to Ryall | 1 |
| Ronan | Rinn to Ryall | 22 |
| Ronayne | Rinn to Ryall | 1 |
| Rooghan | Rinn to Ryall | 1 |
| Rooney | Rinn to Ryall | 4 |
| Rorke | Rinn to Ryall | 2 |
| Rose | Rinn to Ryall | 2 |
| Rosingrave | Rinn to Ryall | 1 |
| Roslewn | Rinn to Ryall | 1 |
| Ross | Rinn to Ryall | 7 |
| Rosslewin | Rinn to Ryall | 4 |
| Rouen | Rinn to Ryall | 1 |
| Roughan | Rinn to Ryall | 84 |
| Roughann | Rinn to Ryall | 1 |
| Roughin | Rinn to Ryall | 1 |
| Rouhan | Rinn to Ryall | 2 |
| Rourke | Rinn to Ryall | 25 |
| Rowan | Rinn to Ryall | 13 |
| Rowen | Rinn to Ryall | 2 |
| Rowhan | Rinn to Ryall | 7 |
| Rowlan | Rinn to Ryall | 1 |
| Rowland | Rinn to Ryall | 6 |
| Ruan | Rinn to Ryall | 1 |
| Ruane | Rinn to Ryall | 9 |
| Rush | Rinn to Ryall | 1 |
| Russell | Rinn to Ryall | 79 |
| Rutherford | Rinn to Ryall | 3 |
| Ryal | Rinn to Ryall | 2 |
| Ryall | Rinn to Ryall | 4 |
| Ryan | Ryan to Ryrure | 337 |
| Ryder | Ryan to Ryrure | 5 |
| Rynd | Ryan to Ryrure | 2 |
| Rynne | Ryan to Ryrure | 4 |
| Ryrure | Ryan to Ryrure | 1 |
| Sage | Sage to Shallue | 1 |
| Sally | Sage to Shallue | 2 |
| Salmon | Sage to Shallue | 15 |
| Sammon | Sage to Shallue | 1 |
| Sampson | Sage to Shallue | 42 |
| Sarsfield | Sage to Shallue | 2 |
| Saunders | Sage to Shallue | 2 |
| Savage | Sage to Shallue | 3 |
| Scahill | Sage to Shallue | 1 |
| Scail | Sage to Shallue | 1 |
| Scale | Sage to Shallue | 1 |
| Scales | Sage to Shallue | 24 |
| Scanlan | Sage to Shallue | 92 |
| Scanlon | Sage to Shallue | 43 |
| Scarry | Sage to Shallue | 2 |
| Schoales | Sage to Shallue | 2 |
| Scott | Sage to Shallue | 38 |
| Scullane | Sage to Shallue | 4 |
| Scully | Sage to Shallue | 9 |
| Sealon | Sage to Shallue | 1 |
| Sears | Sage to Shallue | 1 |
| Seaton | Sage to Shallue | 2 |
| Seery | Sage to Shallue | 1 |
| Seward | Sage to Shallue | 1 |
| Sexton | Sage to Shallue | 103 |
| Seymour | Sage to Shallue | 1 |
| Shallae | Sage to Shallue | 1 |
| Shalley | Sage to Shallue | 1 |
| Shalloe | Sage to Shallue | 1 |
| Shalloo | Sage to Shallue | 14 |
| Shallow | Sage to Shallue | 2 |
| Shallue | Sage to Shallue | 2 |
| Shally | Shally to Sheehan | 6 |
| Shalon | Shally to Sheehan | 3 |
| Shaloo | Shally to Sheehan | 1 |
| Shanahan | Shally to Sheehan | 22 |
| Shane | Shally to Sheehan | 1 |
| Shank | Shally to Sheehan | 3 |
| Shanley | Shally to Sheehan | 1 |
| Shannahan | Shally to Sheehan | 4 |
| Shannon | Shally to Sheehan | 89 |
| Shanny | Shally to Sheehan | 1 |
| Sharry | Shally to Sheehan | 19 |
| Shaughnessy | Shally to Sheehan | 62 |
| Shaw | Shally to Sheehan | 7 |
| Shea | Shally to Sheehan | 63 |
| Sheahan | Shally to Sheehan | 8 |
| Sheedy | Shally to Sheehan | 56 |
| Sheehan | Shally to Sheehan | 82 |
| Sheehy | Sheehy to Stacpoole | 21 |
| Sheely | Sheehy to Stacpoole | 1 |
| Shehan | Sheehy to Stacpoole | 4 |
| Sheils | Sheehy to Stacpoole | 1 |
| Shelton | Sheehy to Stacpoole | 1 |
| Sheridan | Sheehy to Stacpoole | 13 |
| Sherry | Sheehy to Stacpoole | 1 |
| Shinners | Sheehy to Stacpoole | 5 |
| Shoebotham | Sheehy to Stacpoole | 1 |
| Short | Sheehy to Stacpoole | 1 |
| Shuley | Sheehy to Stacpoole | 1 |
| Silver | Sheehy to Stacpoole | 1 |
| Simmons | Sheehy to Stacpoole | 3 |
| Simons | Sheehy to Stacpoole | 1 |
| Sinclair | Sheehy to Stacpoole | 5 |
| Singleton | Sheehy to Stacpoole | 21 |
| Sinon | Sheehy to Stacpoole | 3 |
| Sitright | Sheehy to Stacpoole | 4 |
| Skeaghan | Sheehy to Stacpoole | 1 |
| Skeahan | Sheehy to Stacpoole | 1 |
| Skehan | Sheehy to Stacpoole | 32 |
| Skehane | Sheehy to Stacpoole | 3 |
| Skerrett | Sheehy to Stacpoole | 10 |
| Skerritt | Sheehy to Stacpoole | 3 |
| Skillane | Sheehy to Stacpoole | 1 |
| Slattery | Sheehy to Stacpoole | 95 |
| Slavin | Sheehy to Stacpoole | 1 |
| Sliney | Sheehy to Stacpoole | 1 |
| Smack | Sheehy to Stacpoole | 1 |
| Smarks | Sheehy to Stacpoole | 1 |
| Smiley | Sheehy to Stacpoole | 2 |
| Smith | Sheehy to Stacpoole | 40 |
| Smyth | Sheehy to Stacpoole | 5 |
| Sneezum | Sheehy to Stacpoole | 1 |
| Somers | Sheehy to Stacpoole | 1 |
| Somerset | Sheehy to Stacpoole | 1 |
| Spade | Sheehy to Stacpoole | 4 |
| Spaight | Sheehy to Stacpoole | 33 |
| Sparling | Sheehy to Stacpoole | 4 |
| Spellacy | Sheehy to Stacpoole | 28 |
| Spellasy | Sheehy to Stacpoole | 1 |
| Spellessy | Sheehy to Stacpoole | 1 |
| Spellicey | Sheehy to Stacpoole | 1 |
| Spellicy | Sheehy to Stacpoole | 3 |
| Spelling | Sheehy to Stacpoole | 2 |
| Spellissy | Sheehy to Stacpoole | 1 |
| Spelman | Sheehy to Stacpoole | 2 |
| Spillacy | Sheehy to Stacpoole | 2 |
| Spillicey | Sheehy to Stacpoole | 1 |
| Sporling | Sheehy to Stacpoole | 1 |
| Spruggy | Sheehy to Stacpoole | 1 |
| St John | Sheehy to Stacpoole | 1 |
| St Laurence | Sheehy to Stacpoole | 4 |
| St Lawrence | Sheehy to Stacpoole | 1 |
| St Leger | Sheehy to Stacpoole | 6 |
| Stack | Sheehy to Stacpoole | 23 |
| Stackpole | Sheehy to Stacpoole | 3 |
| Stackpoole | Sheehy to Stacpoole | 27 |
| Stacpoole | Sheehy to Stacpoole | 47 |
| Stafford | Stafford to Synge | 12 |
| Stamer | Stafford to Synge | 4 |
| Stamers | Stafford to Synge | 1 |
| Stammer | Stafford to Synge | 1 |
| Stammers | Stafford to Synge | 1 |
| Standford | Stafford to Synge | 1 |
| Stannard | Stafford to Synge | 1 |
| Stanner | Stafford to Synge | 1 |
| Stanton | Stafford to Synge | 2 |
| Stapleton | Stafford to Synge | 22 |
| Stawell | Stafford to Synge | 2 |
| Steel | Stafford to Synge | 1 |
| Steele | Stafford to Synge | 1 |
| Steevans | Stafford to Synge | 1 |
| Stenson | Stafford to Synge | 3 |
| Stepan | Stafford to Synge | 1 |
| Stephens | Stafford to Synge | 13 |
| Stephenson | Stafford to Synge | 3 |
| Sterling | Stafford to Synge | 2 |
| Sterrick | Stafford to Synge | 1 |
| Stewart | Stafford to Synge | 21 |
| Stinchin | Stafford to Synge | 1 |
| Stinson | Stafford to Synge | 2 |
| Storan | Stafford to Synge | 7 |
| Stradford | Stafford to Synge | 1 |
| Stratford | Stafford to Synge | 11 |
| Stritch | Stafford to Synge | 14 |
| Studdart | Stafford to Synge | 8 |
| Studdert | Stafford to Synge | 116 |
| Stuncheon | Stafford to Synge | 1 |
| Stundon | Stafford to Synge | 1 |
| Sullivan | Stafford to Synge | 163 |
| Supple | Stafford to Synge | 1 |
| Sweeney | Stafford to Synge | 23 |
| Sweeny | Stafford to Synge | 19 |
| Swift | Stafford to Synge | 2 |
| Sykes | Stafford to Synge | 1 |
| Synge | Stafford to Synge | 29 |
| Taaffe | Taaffe to Tierney | 9 |
| Talbot | Taaffe to Tierney | 10 |
| Talbott | Taaffe to Tierney | 1 |
| Tallent | Taaffe to Tierney | 3 |
| Taltee | Taaffe to Tierney | 1 |
| Talty | Taaffe to Tierney | 64 |
| Tamplin | Taaffe to Tierney | 4 |
| Tandy | Taaffe to Tierney | 18 |
| Tarsan | Taaffe to Tierney | 1 |
| Tarsnan | Taaffe to Tierney | 4 |
| Tarsnon | Taaffe to Tierney | 2 |
| Tate | Taaffe to Tierney | 1 |
| Tatten | Taaffe to Tierney | 1 |
| Tatton | Taaffe to Tierney | 1 |
| Tatty | Taaffe to Tierney | 1 |
| Taylor | Taaffe to Tierney | 27 |
| Teate | Taaffe to Tierney | 3 |
| Teefy | Taaffe to Tierney | 1 |
| Teerney | Taaffe to Tierney | 1 |
| Teirney | Taaffe to Tierney | 4 |
| Tent | Taaffe to Tierney | 1 |
| Terry | Taaffe to Tierney | 1 |
| Therry | Taaffe to Tierney | 2 |
| Thomond | Taaffe to Tierney | 89 |
| Thompson | Taaffe to Tierney | 10 |
| Thornberry | Taaffe to Tierney | 1 |
| Thornton | Taaffe to Tierney | 4 |
| Thyme | Taaffe to Tierney | 1 |
| Thyne | Taaffe to Tierney | 2 |
| Thynne | Taaffe to Tierney | 29 |
| Tiberty | Taaffe to Tierney | 1 |
| Tidd | Taaffe to Tierney | 1 |
| Tierney | Taaffe to Tierney | 59 |
| Timmins | Timmins to Tyrrell | 2 |
| Timmons | Timmins to Tyrrell | 6 |
| Timon | Timmins to Tyrrell | 1 |
| Tine | Timmins to Tyrrell | 5 |
| Tobin | Timmins to Tyrrell | 17 |
| Tobyn | Timmins to Tyrrell | 1 |
| Tomkins | Timmins to Tyrrell | 2 |
| Tompane | Timmins to Tyrrell | 2 |
| Toohey | Timmins to Tyrrell | 1 |
| Toohig | Timmins to Tyrrell | 1 |
| Toohy | Timmins to Tyrrell | 37 |
| Toole | Timmins to Tyrrell | 11 |
| Toomey | Timmins to Tyrrell | 1 |
| Toomy | Timmins to Tyrrell | 2 |
| Tooney | Timmins to Tyrrell | 2 |
| Torpey | Timmins to Tyrrell | 20 |
| Torphy | Timmins to Tyrrell | 1 |
| Torpy | Timmins to Tyrrell | 31 |
| Tottenham | Timmins to Tyrrell | 7 |
| Totton | Timmins to Tyrrell | 1 |
| Toughey | Timmins to Tyrrell | 7 |
| Toughy | Timmins to Tyrrell | 1 |
| Touhy | Timmins to Tyrrell | 1 |
| Townsell | Timmins to Tyrrell | 2 |
| Tracy | Timmins to Tyrrell | 13 |
| Trane | Timmins to Tyrrell | 2 |
| Trant | Timmins to Tyrrell | 1 |
| Trassy | Timmins to Tyrrell | 1 |
| Trawley | Timmins to Tyrrell | 5 |
| Treacy | Timmins to Tyrrell | 3 |
| Tropy | Timmins to Tyrrell | 2 |
| Trounsel | Timmins to Tyrrell | 2 |
| Trousdell | Timmins to Tyrrell | 15 |
| Troy | Timmins to Tyrrell | 7 |
| Tubbriddy | Timmins to Tyrrell | 3 |
| Tubbridy | Timmins to Tyrrell | 4 |
| Tubbs | Timmins to Tyrrell | 1 |
| Tubrety | Timmins to Tyrrell | 2 |
| Tubrid | Timmins to Tyrrell | 1 |
| Tubridy | Timmins to Tyrrell | 15 |
| Tucker | Timmins to Tyrrell | 3 |
| Tuite | Timmins to Tyrrell | 4 |
| Tully | Timmins to Tyrrell | 7 |
| Tuohy | Timmins to Tyrrell | 55 |
| Turner | Timmins to Tyrrell | 7 |
| Tuthill | Timmins to Tyrrell | 13 |
| Tuttle | Timmins to Tyrrell | 7 |
| Tweedy | Timmins to Tyrrell | 3 |
| Twohy | Timmins to Tyrrell | 5 |
| Tymons | Timmins to Tyrrell | 2 |
| Tynan | Timmins to Tyrrell | 1 |
| Tyne | Timmins to Tyrrell | 2 |
| Tyner | Timmins to Tyrrell | 1 |
| Tyrell | Timmins to Tyrrell | 3 |
| Tyrrell | Timmins to Tyrrell | 1 |
| Uniacke | "U" Surnames | 1 |
| Unthank | "U" Surnames | 1 |
| Valentine | "V" Surnames | 2 |
| Vanally | "V" Surnames | 1 |
| Vance | "V" Surnames | 3 |
| Vandeleur | "V" Surnames | 108 |
| Varihy | "V" Surnames | 1 |
| Varily | "V" Surnames | 2 |
| Vaughan | "V" Surnames | 79 |
| Veale | "V" Surnames | 1 |
| Veetch | "V" Surnames | 1 |
| Vereker | "V" Surnames | 1 |
| Verlin | "V" Surnames | 2 |
| Verling | "V" Surnames | 2 |
| Vesey | "V" Surnames | 9 |
| Vickers | "V" Surnames | 1 |
| Vincent | "V" Surnames | 6 |
| Wade | Wade to Westropp | 5 |
| Wadson | Wade to Westropp | 1 |
| Walker | Wade to Westropp | 16 |
| Wall | Wade to Westropp | 22 |
| Wallace | Wade to Westropp | 11 |
| Wallis | Wade to Westropp | 1 |
| Wallnut | Wade to Westropp | 1 |
| Wallnutt | Wade to Westropp | 1 |
| Wallplate | Wade to Westropp | 2 |
| Walnut | Wade to Westropp | 4 |
| Walsh | Wade to Westropp | 191 |
| Walton | Wade to Westropp | 7 |
| Wandesforde | Wade to Westropp | 5 |
| Ward | Wade to Westropp | 15 |
| Warm | Wade to Westropp | 1 |
| Warrant | Wade to Westropp | 1 |
| Warren | Wade to Westropp | 8 |
| Warrent | Wade to Westropp | 1 |
| Washington | Wade to Westropp | 1 |
| Waters | Wade to Westropp | 13 |
| Watson | Wade to Westropp | 13 |
| Watton | Wade to Westropp | 1 |
| Welch | Wade to Westropp | 5 |
| Weldon | Wade to Westropp | 1 |
| Wells | Wade to Westropp | 1 |
| Welsh | Wade to Westropp | 6 |
| Wesby | Wade to Westropp | 2 |
| West | Wade to Westropp | 1 |
| Westby | Wade to Westropp | 54 |
| Westropp | Wade to Westropp | 43 |
| Whelan | Whelan to Wynne | 59 |
| White | Whelan to Wynne | 118 |
| Whitecome | Whelan to Wynne | 1 |
| Whitelock | Whelan to Wynne | 2 |
| Whitelocke | Whelan to Wynne | 12 |
| Whitestone | Whelan to Wynne | 3 |
| Whitford | Whelan to Wynne | 1 |
| Whitstone | Whelan to Wynne | 1 |
| Whitty | Whelan to Wynne | 6 |
| Wilbee | Whelan to Wynne | 1 |
| Wild | Whelan to Wynne | 1 |
| Wiley | Whelan to Wynne | 1 |
| Wilkinson | Whelan to Wynne | 6 |
| Williams | Whelan to Wynne | 24 |
| Willis | Whelan to Wynne | 2 |
| Wilson | Whelan to Wynne | 30 |
| Winder | Whelan to Wynne | 4 |
| Winkle | Whelan to Wynne | 1 |
| Winne | Whelan to Wynne | 7 |
| Winnett | Whelan to Wynne | 3 |
| Winter | Whelan to Wynne | 1 |
| Winters | Whelan to Wynne | 1 |
| Wise | Whelan to Wynne | 1 |
| Wolfe | Whelan to Wynne | 9 |
| Wood | Whelan to Wynne | 2 |
| Woodcock | Whelan to Wynne | 1 |
| Woods | Whelan to Wynne | 32 |
| Woodward | Whelan to Wynne | 8 |
| Worrall | Whelan to Wynne | 2 |
| Woulfe | Whelan to Wynne | 5 |
| Wray | Whelan to Wynne | 1 |
| Wren | Whelan to Wynne | 9 |
| Wrenfordsly | Whelan to Wynne | 1 |
| Wrenne | Whelan to Wynne | 1 |
| Wright | Whelan to Wynne | 7 |
| Wrightson | Whelan to Wynne | 2 |
| Wrinne | Whelan to Wynne | 2 |
| Wrixon | Whelan to Wynne | 1 |
| Wrynn | Whelan to Wynne | 1 |
| Wrynne | Whelan to Wynne | 13 |
| Wyley | Whelan to Wynne | 1 |
| Wyndham | Whelan to Wynne | 127 |
| Wynne | Whelan to Wynne | 3 |
| Young | "Y" Surnames | 3 |