| Connell | numerous: Down, Midlands, Connacht. Ir. Mac Dhomhnaill (Ulster), Mac Conaill. In some instances, MacConnon has been changed to MacConnell. SI. |
| Cormack | Quite numerous: Galway, Tipperary, Kilkenny. Ir. Mac Cormaic. From the very popular personal name Cormac, derivation of which is not clear. Usually as MacCormack. |
| Mac Conaill | Mac Connell: an-líonmhar: Cúige Uladh. Claochlú ar Mac Dhomhnaill atá ann. |
| Mac Cormaic | Mac Cormack, Mac Cormick: an-líonmhar ins gach aird: go sonrach Lár na Tíre & oirthear Uladh - Albanaigh iad sa, cuid mhaith. Tháinig an sloinne seo i bhfeidhm in áiteanna éagsúla timpeall na tíre. Bhí clann amháin aitheanta i Longfort.IF. |
| Mac Dhomhnaill | Mac Connell, Mac Gonnell: líonmhar i gCúige Uladh. Ar aon dul le Mac Domhnaill. Séimhiú an D tosaigh sa teanga labhartha is cúis leis an ngalldú sa. |
| MacConnell | Very numerous: Ulster generally, Midlands etc. Ir. Mac Dhomhnaill (son of Dónall). The name is identical with Mac Donnell which is more generally in use. Septs were located in Antrim and Fermanagh. |
| MacCormack | Very numerous: all areas, especially Midlands. Ir. Mac Cormaic (son of Cormac), a popular first name. There was a sept in Longford but the name is general. |
| MacCormick | Very numerous: E Ulster, less so elsewhere. Otherwise as Mac Cormack. Mac Lysaght considers many of the Ulster people to be of Scottish origin. |
Parishes where McCormack and a second surname are found together
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