| Mac Giolla Ruaidh | Mac Elroy, Gilroy, Kilroy: líonmhar: iarthar Uladh & tuaisceart Chonnacht & rl. As Baile Mhic Ghiolla Ruaidh, taobh thoir de Loch Éirne, dóibh, is cosúil - bhí siad líonmhar i bhFear Manach agus Liatroim sa 17 céad. Luadh go minic ins na h-Annála iad sa 15 céad. IF & SGG. |
| MacElroy | numerous: Tyrone-Fermanagh, Armagh-Monaghan-Louth etc. Ir. Mac Giolla Rua, red-haired youth or servant. A sept of Fermanagh, often changed to Gilroy, Kilroy, q.v. |
| MacIlroy | numerous: Ulster generally, especially Antrim. Ir. Mac Giolla Ruaidh, son of red-haired attendant. The name was widespread in Scotland. |
Parishes where McElroy and a second surname are found together
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