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Surname Dwan (Dwan , 多万 , دوان ) , throughout the world, is quite a rare family name. The cognomen Dwan is characteristic of Ireland, where it is quite a rare surname, Isle of Man, and Australia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in the United States, Ireland, and India. Also, Dwan is the forename as well as the last name.