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| Holahan | rare: Dublin, Cavan. See Holohan. |
| Holohan | numerous: Kilkenny-Laois-Tipperary, Down. Ir. Ó h-Uallacháin, uallach, proud. Septs of Mid-Leinster and Clare. The anglicised versions of this name are many, it is usually Houlihan in Munster. SI & IF. |
| Hoolahan | rare: Dublin. See Holohan. |
| Houlahan | rare: Dublin, Armagh. See Houlihan. |
| Houlihan | numerous: Munster, S Leinster etc. Ir. Ó h-Uallacháin, uallach, proud. Families of Offaly and Clare. Changed to Holland in W Cork and Nolan in Connacht. See also Holohan and Holian. IF & SGG. |
Parishes where Oulighan and a second surname are both baptised.
This list shows total Oulighan Roman Catholic baptisms by county.
Click on the county to see detail.