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Surname Dui (Dui , ดุย , ดุ่ย) , worldwide, is quite a common last name. The family name Dui is characteristic of Taiwan, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Italy, where it is a rare surname. In absolute terms, it is commonest in Taiwan, India, and China. Also, Dui is the forename as well as the last name.