Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
GUY
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
A term given in Gaul to the mistletoe, or cure-all; also a guide, a leader or director, from Guia, Sp. and Port.
Patronymica Britannica (1860)
GUY. The old personal name Guido, probably from Cains, and the Celtic Kei, as Baxter thinks. Glossary, p. 58.
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