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| Mac Coscair | Mac Cusker, Cosgrave, Cosgrove : féach Mac Oscair. |
| Mac Oscair | Mac Cusker, Cosgrave: líonmhar: Fear Manach-Tír Eoghain & rl. Craobh de Mhag Uidhir Fhear Manach. Bhí an t-ainm Oscar (fia-chara) coitinn. |
| MacCosker | rare: Strabane (Tyrone). See Mac Cusker. |
| MacCusker | numerous: Fermanagh, Tyrone and Ulster generally. Ir. Mac Oscair, from first name Oscar, dear-lover, popular amongst the Maguires of Fermanagh to whom this sept were related. GPN, SI. |
Parishes where McOsker and a second surname are both baptised.