| Antrim: | 42 | Armagh: | 4 | Belfast city: | 6 | Cavan: | 5 |
| Derry: | 10 | Donegal: | 13 | Down: | 36 | Dublin: | 1 |
| Dublin city: | 1 | Fermanagh: | 4 | Monaghan: | 5 | Tyrone: | 3 |
| Mac Giolla Bháin | Mac Ilwaine, Kilbane: líonmhar i gCúige Uladh ach líon beag Kilbane i gConnachta. Tá an sloinne nasctha le Sligeach ach d'fhéadfadh cuid mhaith des na h-Ultaigh a bheith de bhunadh Albanach .i. Mac Giolla Bheathain. |
| MacElwaine | fairly rare: scattered in Ulster. This name may be (1) Ir. Mac Giolla Bháin (fair servant; (2) Scottish Mac Giolla Bheathain (devotee of St Beathan). The former was a N Connacht group. MacLysaght thinks that most of the Ulster people are of Scottish origin. |
| MacIlwaine | numerous: Ulster generally. Ir. Mac Giolla Bháin, son of the fair attendant, youth. A sept of Sligo according to Woulfe; however the Scottish name Mac Giolla Bheathain (devotee of St Beathan) is also extant and may well account for those in Ulster. |
| MacIlween | Very rare: Belfast. Ir. Mac Giolla Mhín (gentle youth). Usually Mac Ilveen, q.v. |
Parishes where McIlwaine and a second surname are found together
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