No Coolgan households in Griffith's.
| Colgan | numerous: Dublin, Ulster, Midlands etc. Ir. Mac Colgan. From Colga, an early personal name. A sept in Derry was originally Ó Colgan; another was seated at Kilcolgan in Offaly. IF & SGG. |
| Mac Colgan | Colgan: cuíosach líonmhar: Ulaidh & Lár na Tíre. Bhí Mac Colgan suite ag Cill Colgan, Uíbh Flailí. Bhí Ó Colgan (ar dtús) ag Tír Ciabháin, Doire, ach tugadh Mac Colgan orthu sa 16 céad. Ón ainm pearsanta Colga. |
| MacColgan | fairly numerous: Derry-Tyrone etc. Ir. Mac Colgan, from old first name Colga. There were septs in Derry and Offaly. SGG. |
Parishes where Coolgan and a second surname are found together
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