| Carlow: | 6 | Cavan: | 3 | Clare: | 21 | Cork: | 76 |
| Cork city: | 9 | Donegal: | 3 | Galway: | 4 | Kerry: | 99 |
| Kildare: | 1 | Kilkenny: | 30 | Limerick: | 124 | Limerick city: | 5 |
| Offaly: | 10 | Roscommon: | 5 | Tipperary: | 188 | Tyrone: | 5 |
| Waterford: | 57 | Westmeath: | 11 | Wexford: | 12 | Wicklow: | 1 |
| Ó Seanacháin | Shanahan: líonmhar: sa Mhumhain & Oir-dheisceart. Clann de chuid Dál gCais a díbríodh ag an Brianaigh i 1318 agus a scaipeadh ar fud na Mumhan. Bíonn Shannon orthu go minic ina dtír dúchais, an Clár. Fréamh: seanach, sean, críona. |
| Shanaghan | Very rare: Castlederg (Tyrone). See Shanahan. |
| Shanahan | numerous: Munster and South East etc. Ir. Ó Seanacháin, dimin. of sean, an elder. They were a sept of Thomond, dispersed in 14 cent. Often changed to Shannon, q.v. |
Parishes where Shanahan and a second surname are found together
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