For background on how the map was made (and its flaws), see the relevant blog entry.
|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.|
DEDs where Foster and a second surname are found together