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 surnamesScully
The Sully surname in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Fr. Local) From the town of Sully, in the province of Orleans, France.