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| Forrester | Quite numerous: Dublin, Ulster. English. DBS. |
| Forster | fairly numerous: Belfast, Down, Fermanagh, Longford. English, as Forrester. |
| Forsythe | numerous: Antrim, Down and general. Scots Gael. Ó Fearsíthe (man of peace) but generally from Scottish placename. |
| 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 Forster and a second surname are both baptised.
This list shows total Forster Roman Catholic baptisms by county.
Click on the county to see detail.