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Last name Quinlan (Quinlan , 昆兰 ) , around the world, is a common cognomen. The surname Quinlan is characteristic of Saint Kitts and Nevis, where it is quite a common surname, Ireland, and Jersey (explore the name in all countries). Measured by absolute frequency, it is the most numerous in the United States, Ireland, and Australia. Much less frequently, Quinlan is the forename as well as the last name.