Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
CATHCART
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Gaelic. Local) From the parish of Cathcart, in Lanark and Renfrew, Scotland. The river Cart runs through it, whence the name is derived. Caeth-Cart, from caeth, a strait, the river here running in a narrow channel.
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic