Parishes where Cologan and a second surname are found together
|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.|
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