Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
CALVERT
As described in historical dictionaries
Patronymica Britannica (1860)
CALVERT. The baronet's family trace to a Mr. C, who was minister of AndoA'cr, CO. Hants, in the XVI. cent., and probably of French extraction.
Surname type: Occupational name
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English