Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
BUCHAN
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) A district of Aberdeenshire, Scotland. The derivation of the name is uncertain. It may be from the Gaelic boc, bocan, deer; a place abounding in deer.
Patronymica Britannica (1860)
BUCHAN. A district of Aberdeenshire, which gave title of earl to the fiirailies of Cummins and Erskinc. The lirst of the Biichans is stated to have been a son of the last Earl of Buchau of the Comyn family.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic