The Irish surname Quinlan is derived from the ancient Gaelic surname O' Caoindealbhain. The translation is the male descendant of Caoindealbhan, a personal name meaning the son of the comely one and is composed of the elements caoin-dealbh and the diminutive suffix -an, meaning “son of.” It can also be a form of the surname O'Conaillain, meaning descendant of Conaillan, a personal name representing a diminutive of Conall, composed of the elements con meaning “ hound” and  gal meaning “valor.” The surname Quinlan is chiefly found in counties Tipperary and Cork. 

QUINLAN FAMILY CREST PENDANT