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Some Historical Notes on the Guerin Surname in Co. Clare by Pat Guerin
Irish/Gaelic Origins: Ms 545

Thomas Guerin of Canada (Ms GO545) continues:

“Geran may also have been a form used by the Normans in Ireland for we find in the ‘Chartularies of St. Mary’s Abbey, Dublin’, public records Office Vol I pages 462-463, 465 & 469, circa 1225 to 1250 the names of Baldwyn Geran appended to records.
Also Registers of St. Thomas’ Abbey, Dublin, Public Records Office, pages 80, 169–124, 209, 285 and 375, in the year 1225, the name of Garin (spelled also Garinus for the entries are all in Latin) Archdeacon of Glendoloch.

Geran, Abbot of Saghair died in 868.

It is also found in the grants of Elizabeth.

No. 5808 - April 1593.
Pardon of Taige Mac M. O’Gerane of Balimolchai, relating to persons in Roscommon, Clare & Galway

No. 6495 - April 1601 .
Pardon of Morish Mac Canagher O’Gyeran in list of Kerry pardons

No. 6529 – 25 May 1601
Pardon of Morish O’Geran, Kerry

No. 6511- May 1601
Pardon to Donnell O’Sullivan Bere and following, the name of Diermond Oge Ny Geirine of Glenhanaries (?), near Bantry appears

On the other hand the name Guerin does not appear in Ireland before the Huguenot migration and the first heard of it is in the will of Jasper Guerin proved in Charleville, Co. Cork in 1670. ”

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