Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
SOMERVILLE
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
The village near a marsh or lake; So mer, a marshy soil, near water or the sea. So, for swl, sal, the earth, soil, land. Samhradh, Gaelic, summer, from Samh, the sun. Somerset may have been so called because the primitive inhabitants had an altar to the sun, samh, or because the country lay to the south.
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic