As described in historical dictionaries

An Etymological Dictionary of Family and Christian Names (1857)

A contraction of Gregor, the same as Greer (which see).

Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.


Patronymica Britannica (1860)

GRIER. See Gregory.

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.


Surname type: Occupational name

Origin: Celtic

Region of origin: British Isles

Country of origin: Scotland

Religion of origin: Christian

Language of origin: Gaelic

BritishSurnames.uk is a Good Stuff website.