Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
GRAY
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) A town in Burgundy, France, on the banks of the Saone. Rollo, Chamberlain to Robert, Duke of Normandy, received from him the castle and honor of Croy, in Picardy, whence his family assumed the name of De Croy, afterward changed into De Gray.
Patronymica Britannica (1860)
GRAY. See Grey.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: Nickname
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English