Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
We don't have any stats on how common this name is. This is probably because it's very rare in the UK.
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Related and similar surnamesWelton
The Wilton surname in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) From a town in Wiltshire, England, so called from the river Willey, and ton, a town.