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| Bicker | rare: N Down. English, but also a synonym of MacGivern, q.v. See also Biggar. |
| Biggar | Quite numerous: N Down & Tyrone. Scottish & English, but see Bicker. |
| Biggart | fairly rare: Belfast etc. Scottish, from placename in Ayrshire. |
Parishes where a Bigger and a second surname married each other.