Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
GILBERT
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Ger.) Bright pledge, from Gisle, a pledge; or gold-like, bright, from the Saxon Geele, yellow.
Patronymica Britannica (1860)
GILBERT. A personal name, largely introduced at the Norman Conquest, in the form of Gislebertus. See Domesd. jMSsim. It is not only a very common surname, but has given birtJi to Gi1:))i, Gibbs, Gybbes, Gibbard, Gibbings, Gibbousou, Gibson, Gill, Gilks, Gilpin, and many othei'S.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: From given name or forename
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English