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Surname Đoàn (Doan , Đoàn , فان ) , around the world, is a common cognomen. The cognomen Đoàn is habitual in Vietnam, where it is quite a common surname, Macao, and Australia, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Vietnam, the United States, and Canada. Likewise, Đoàn is the forename as well as the last name.