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| Culbert | fairly numerous: mainly E Ulster, Ossory, Waterford. MacLysaght considers this name is of Huguenot origin, but it may also be Scottish in Ulster. |
| Culbertson | rare: N Antrim. Scottish. |
| Cuthbert | Quite numerous: Dublin, Cork, Belfast area etc. Scottish and N English from St Cuthbert of Lindisfarne, +687 A.D. |
| Cuthbertson | Quite numerous: Tyrone, Belfast. See Cuthbert. |
Parishes where a Cuthbert and a second surname married each other.