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Across the world, Thuan (Thuan , Тхуан , トゥアン ) is a common principally masculine, but scarcely female first name. The forename Thuan is habitual in Macao, where it is quite a common epicene name, Vietnam, where it is quite a common principally male, but scarcely feminine name, and Sri Lanka, where it is a rare male name. In absolute terms, the name is most common in Vietnam, the United States, and Sri Lanka. Much less frequently, Thuan is the last name as well as the forename.