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| Coalter | fairly rare: Fermanagh. Ir. Ó Coltair. See also Coulter. |
| Colter | Very rare: Dublin. See Coulter. |
| Coulter | numerous: mainly Ulster. Ir. Ó Coltair. According to Woulfe, derived from Ó Coltaráin, who were seated in Down. Also Colter. SGG. |
| Ó Coltair | Coulter: an-líonmhar i gCúige Uladh. Ón Dún dóibh, de réir de Bhublh, ach is sloinne Albanach Coulter chomh maith. Bhí Ó Coltaráin ann, leis. |
Parishes where a Colter and a second surname married each other.