In the Gaelic, Duirchc is the comparative of Dorch, dark, cloudy, hence dark—complexioned. It may come from Durga, Gaelic, surly, sour, repulsive. Durgy, in the Cor. Br., signifies a small turf hedge.
Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.