| Colahan | rare: Cork, Galway. Ir. Ó Cúlacháin. A sept of Uí Fiachrach, Mayo. Also occurring as Coolican, Cuolahan. |
| Coolahan | Very rare: Offaly etc. Ir. Mac Uallacháin, uallach, proud. A sept of Offaly also connected with Síol Anmchadha in adjacent Galway. See also Coolican. MIF. |
| Coolican | Very rare: Mayo. Ir. Ó Cúlacháin. Belonged to the Uí Fiachrach of Mayo. There is some confusion with Coolahan, which see. |
| Cuolahan | (1) Ir. Mac Uallacháin - see Coolahan. (2) Ir. Ó Cúlacháin - see Coolican. The name does not appear in current telephone directories, but has been previously recorded.MIF. |
| Mac Uallacháin | Colahan, Coolahan: annamh: Gaillimh thoir-Uíbh Fhailí. Clann de chuid Shíol Anmchadha, a bhí suite i Lusmágh, Uíbh Fhailí. Ní raibh abhainn na Sionainne ina teorainn annseo - bhí Síol Anmchadha ar an dá bhruach. Brí: uallach = bródúil.MIF. |
| Ó Ciobhlacháin | féach Ó Cibhleacháin thuas. |
Parishes where Coolahan and a second surname are found together
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