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Cognomen Mullin (マリン , 穆林 , مولين , and others...) , throughout the world, is a common last name. The last name Mullin is characteristic of Barbados, where it is quite a common surname, Ireland, and Japan, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in the United States, Japan, and the United Kingdom. Very seldom, Mullin is the forename as well as the last name.