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| Tohill | Quite numerous: mainly E Derry. Ir. Ó Tuathail, from first name Tuathal, ruler of people. They were a sept of Derry. See Toal. MIF. |
| Twohill | Very rare: Waterford etc. Ir. Ó Tuathail. Munster version of Toole, q.v. |
Parishes where Tuohil and a second surname are both baptised.
This list shows total Tuohil Roman Catholic baptisms by county.
Click on the county to see detail.