| 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. |
| Wolahan | rare: Dublin etc. Variant of Wolohan, q.v. |
| Wolohan | Quite numerous: Wicklow etc. Ir. Ó h-Uallacháin. A sept of Mid-Leinster. See Houlihan. |
| Woulaghan | Very rare: Antrim. Ir. Ó h-Uallacháin. See Houlihan and Willaghan. |
| Woulahan | Very rare: Arklow (Wicklow). See Wolohan. |
Parishes where Houlahan and a second surname are found together
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