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| Cahill | Very numerous: all provinces but least in Ulster. Ir. Ó Cathail, a very popular personal name in early Ireland (see entry). There were septs in Clare, Tipperary and Kerry. It is one of the earliest surnames on record. IF & SGG. |
| MacCahill | fairly rare: Donegal-Tyrone-Cavan. Ir. Mac Cathail from first name Cathal meaning "strong in battle". May also stand for Mac Cathmhaoil (battle chief). |
| Ó Cathail | Cahill: an-líonmhar ar fud na tíre: Clanna móra sa Mhumhain agus i gConnachta. Ainm pearsanta is ea Cathal a chiallaíonn "calma sa chath".SGG. |
Parishes where Coohill and a second surname are both baptised.