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Family name トゥアン (Tuan , Tuấn , Thuan ) , around the globe, is a common last name. The cognomen トゥアン is habitual in Vietnam, where it is quite a common surname, Malaysia, and Macao. Not in comparison with a country's population, it is commonest in South-eastern Asia, particularly Vietnam, Malaysia, and Philippines. Likewise, トゥアン is the forename as well as the last name.