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| Gourlay | numerous: E Ulster, Donegal. Ir. Mag Thoirdealbhaigh, from the personal name Toirdealbhach which means either "Thor-like" or "instigator". See also Turley. There is also a Scottish name which may well be represented in Ulster. SGG, SS & GPN. |
| Mag Thoirdealbhaigh | Gourlay: líonmhar: Oirthear Uladh, Tír Chonaill. Leagan Ultach de Mac Thoirdealbhaigh, q.v. |
Parishes where Gourley and a second surname are both baptised.