| Antrim: | 20 | Armagh: | 144 | Belfast city: | 8 | Cavan: | 1 |
| Derry: | 48 | Donegal: | 62 | Down: | 34 | Fermanagh: | 1 |
| Longford: | 1 | Louth: | 63 | Mayo: | 4 | Meath: | 1 |
| Monaghan: | 23 | Tyrone: | 50 |
| Johnson | numerous: all areas: English & Scottish; also anglicisation of Mac Seáin (MacShane) who were a branch of the O'Neills. |
| Mac Seáin | rare: scattered. Ir.Lang. See Mac Shane. |
| Mac Seáin | Mac Shane: líonmhar: Cúige Uladh, Lú-an Mhí. Craobh de Niallaigh Thír Eoghain ach seasann don sloinne Johnson i gcoitinne. |
| MacShane | numerous: Ulster generally, Louth-Meath etc. Ir. Mac Seáin, the first name Seán is a gaelicisation of Norman-French Jean. A branch of the O'Neills of Tyrone. SI. |
Parishes where McShane and a second surname are found together
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