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| Gilsenan | numerous: N Leinster, S Ulster. Ir. Mac Giolla Seanáin ( devotee of St Senan). A sept of Tyrone which spread south and changed to Nugent and Leonard. The name occurs as Shannon which is widespread in Ulster. SI & SGG. |
| Gilson | rare: scattered. An English name but in Offaly it may stand for Gilsenan, q.v. |
| Giltenane | Quite numerous: Limerick-Cork. Ir. Mac Giolla tSeanáin (devotee of St Senan). A Munster variant of Gilsenan, though this may refer to the best-known of the various Senans, he of Inis Cathaigh (Scattery Is.) SI & SGG. |
| Mac Giolla Seanáin | Gilsenan: líonmhar i ndeisceart Uladh agus tuaisceart Laighean ach bíonn siad faoin mbréagriocht: Nugent, Leonard agus Shannon, chomh maith. Tír Eoghain a ndúiche shinseartha. Féach Mac Giolla t-Seanáin, leis. SI. |
| Mac Giolla t-Seanáin | Giltenan: líon beag: Luimneach-Corcaigh. An Seanán is mó (dar leis na Muimhnigh) ná bunaitheoir mhainistir Inis Cathaigh in inbhear na Sionainne. Bíonn Shannon orthu sa Chlár, chomh maith. Féach Mac Giolla Seanáin, leis. |
Parishes where Gilsenan and a second surname are both baptised.
This list shows total Gilsenan Roman Catholic baptisms by county.
Click on the county to see detail.