Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
BULLOCK
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
A full-grown ox. All the families of Bulls, Bullards, and Bullocks are noted for being firm and inflexible in their way.
Surname type: Nickname
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English