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| Colchún | Colhoun: cuíosach líonmhar: Doire, Tír Conaill. Albanach - Colquhoun annsin. |
| Colhoun | fairly numerous: Derry, Donegal etc. Ir. Colchún. This is really the Scottish name Colquhoun, from a place in Dumbarton. Scots Gaelic is Mac a' Chounich. SI & SS. |
| Colquhoun | fairly rare: Belfast, Dublin. Scottish, of recent immigration. See Colhoun. |
Parishes where Colhoun and a second surname are both baptised.