No Thomasson households in Griffith's.
Mac Tomáis | Thomson: líonmhar: an Dún & rl. Albanaigh arís. |
Thompson | Very numerous: all areas, especially Ulster, Dublin, South East. One of the most numerous non-indigenous names, usually of English origin. |
Thomson | numerous: Belfast area, Down etc. Scottish. |
Parishes where Thomasson and a second surname are found together
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