Family name トゥエン (Tuyen 
, トゥエン) , around the world, is a common surname. The last name トゥエン is habitual in Macao, where it is quite a common surname, Vietnam, where it is quite a rare surname, and Malaysia. Not in comparison with a country's population, it is commonest in Vietnam, Malaysia, and the United States. Also, トゥエン is the forename as well as the last name.