The Irish surname Murff, also found in Scotland, is of patronymic origin deriving from the Gaelic name O'Murchu meaning "descendant of the sea-warrior." The Murff family are first found in County Wexford where they held an ancestral seat from early times. Today it's more common variant Murphy is the most common surname in Ireland with many bearers hailing from County Cork. Murff is the 20,744th most common name in the United states with over 1,185 bearers living there.