|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 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.|
|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 Cormac and a second surname are found together
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