Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
DARWIN
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Welsh.) From Derwin, an oak; local, Derwent, a river in England.
Patronymica Britannica (1860)
DARWIN. Deorwynwas an A-Sax. femnle name. Ferguson, p. 198.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English