Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
BARNUM
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) A corruption of Bearnham, the town in the wood or hill. Bern, in the Swiss language, signifies a bear. This family was originally of Southwick, County Hants, England.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English