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| 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 a McShane and a second surname married each other.