|Forrester||Quite numerous: Dublin, Ulster. English. DBS.|
|Forster||fairly numerous: Belfast, Down, Fermanagh, Longford. English, as Forrester.|
|Foster||numerous: Ulster, N Leinster, N Munster. English, (1) foster-parent, (2) variant of Forrester. Reaney also mentions Forseter, a shearer, as a possible derivation. DBS.|
Parishes where O'Foster and a second surname are found together
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