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|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 Thomson and a second surname are both baptised.
This list shows total Thomson Roman Catholic baptisms by county and parish.
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