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| Colligan | rare: Belfast, Dublin. Ir. Ó Colgan. See also Colgan. |
| Colohan | rare: E Galway etc. Ir. Mac Uallacháin, uallach meaning proud. These were a sept of Síol Anmchadha seated in Offaly. Compare Colahan. MIF. |
Parishes where Cologan and a second surname are both baptised.
This list shows total Cologan Roman Catholic baptisms by county.
Click on the county to see detail.