McCormick is a family name (surname) that originated in Ireland and Scotland. Spelling variations: Cormack, MacCormack, McCormack, McCormick, MacCormick, Cormac, Cormach, Cormich and Cormiche.

A person whose father was named Cormac would identify as Mc (i.e. "son of") Cormac; the combination was continued as the family name by subsequent generations.

Cormac is translated as "Charioteer" or "Warrior". The name was a very popular choice of names by parents in medieval times due to the influence of the Saint of the same name. Saint Cormac was the first Bishop of Cashel, an important diocese in the south of Ireland. Cashel was also the King of Munster and responsible for a famous book of Psalms, the Cashel Psalter. He died in battle in AD 908.