Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
MCCARTHY
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
The son of Carrthach, an Irish chieftain, who lived in the eleventh century.
Surname type: From name of parent
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic