Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
GRIFFITH
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Welsh and Cor. Br.) One who has strong faith, from Cryf, Welsh, strong, and ffyd, faith.
Surname type: From given name or forename
Origin: Celtic
Region of origin: British Isles
Country of origin: Wales
Religion of origin: Christian
Language of origin: Welsh