| Antrim: | 479 | Armagh: | 247 | Belfast city: | 147 | Carlow: | 13 |
| Cavan: | 97 | Clare: | 18 | Cork: | 47 | Cork city: | 7 |
| Derry: | 218 | Donegal: | 201 | Down: | 422 | Dublin: | 68 |
| Dublin city: | 69 | Fermanagh: | 184 | Galway: | 2 | Kerry: | 2 |
| Kildare: | 31 | Kilkenny: | 31 | Laois: | 23 | Leitrim: | 24 |
| Limerick: | 15 | Limerick city: | 12 | Longford: | 38 | Louth: | 14 |
| Mayo: | 31 | Meath: | 22 | Monaghan: | 100 | Offaly: | 24 |
| Roscommon: | 4 | Sligo: | 22 | Tipperary: | 27 | Tyrone: | 324 |
| Waterford: | 17 | Westmeath: | 29 | Wexford: | 18 | Wicklow: | 51 |
| Mac Liam | Wilson: an-líonmhar gach treo - Cúige Uladh ach go h-áirithe. An sloinne gallda is líonmhaire sa tír. Ainm sinseartha ag na Búrcaigh i gConnachta. Aisteach go leor: níl FitzWilliam ar fáil anois. |
| Wilson | Very numerous: predominently Ulster, also Dublin, Midlands & South East. Scottish & English, the most numerous such name in Ireland. Derived, of course, from William. It was a "principal name" in Antrim in 1659. Usually gaelicised Mac Liam. |
Parishes where Wilson and a second surname are found together
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