Thomson, Tomson, Thomison - Anglicised Surnames in Ireland

Padraig Mac Giolla-Domhnaigh
1923

Thomson, Tomson, Thomison—This name in Ulster and Scotland is a Scottish sept name principally of the Clan Campbell or Siol Diarmuid O'Duibhne. It is the anglicised form of a few names, especially M'Tavish and M'Cavish (Mac Thómhais) in North Antrim and the West of Scotland, and of M'Cause, M'Comish and McOmish; the latter three being McFarlane sept. In Gaelic Mac Thómais.

M'Cawis and M'Cause in 1491, in Killin of Lochtay, Scotland.

Alphabetical Index of Anglicised Surnames in Ireland

See also Woulfe’s Irish Names and Surnames
and O'Hart's Irish Pedigrees