No Mac Seoin households in Griffith's.
| Jones | Very numerous: all areas, especially Galway. Ir. Mac Seóin. The most numerous name in Wales, it was common amongst settlers from Britain, 16 & 17 cents. |
| 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. |
| Mac Seoin | Jones: líonmhar, i nGaillimh ach go h-áirithe. Inimircigh sa 16 & 17 céad. |
| 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 Mac Seoin and a second surname are found together
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