Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
DARBY
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) A corruption of Derby, a shire of England, so called from doire, a forest, a woody, hilly country abounding in deer; or it may be Deerby, the town of deer.
Patronymica Britannica (1860)
DARBY. A corruption of Derby. So Darbishire from Derbyshire.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: Location or geographical feature
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English