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| Mac Cuirc | Mac Quirk: annamh: Áth Cliath. I bhfad níos coitinne mar Mag Cuirc, q.v. |
| MacGuirk | numerous: Monaghan, N Leinster etc. Ir. Mag Oirc (SI); Mag Coirc (SGA). First name Corc (crimson) was popular, so perhaps it is to be preferred, but see also Mac Gurk. |
| MacGurk | numerous: Tyrone-S Derry etc. Ir. Mag Oirc. Mac Lysacht is very positive about this name and it was an important group descended from Niall of the Nine Hostages in 5 cent and located in Tyrone.MIF. |
Parishes where MacQuirk and a second surname are both baptised.