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Cognomen 默南 (默南 , Murnan , Murnane ) , throughout the world, is quite a rare surname. The surname 默南 is characteristic of Cayman Islands, where it is quite a common surname, Ireland, where it is quite a rare surname, and Isle of Man. In absolute terms, it is commonest in the United States, Australia, and Ireland. Very seldom, 默南 is the forename as well as the last name.