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| Sommerville | numerous: mainly E Ulster; the family was also associated with Cork. It is English, probably derived from a French place-name. See Summerville. SI. |
| Summerville | Quite numerous: Galway, Belfast area etc. Ir. Ó Somacháin (see Summers). It is also a Norman name from a place in France. See also Somerville. |
Parishes where a Somerville and a second surname married each other.