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Surname Đặng (Dang , Đặng , ダン ) , globally, is a widespread last name. The surname Đặng is characteristic of Vietnam, where it is quite a common surname, Macao, and Martinique (explore the name in all countries). Not in comparison with a country's population, the name is most common in China, Vietnam, and India. Very seldom, Đặng is the forename as well as the last name.