Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
ROUSSEAU
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Fr.) One having reddish hair, carrot color. Ruisseau, local, a brook.
Region of origin: Europe
Country of origin: France
Language of origin: French