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Cognomen Wui (Wui ) , all around the world, is a common last name. The cognomen Wui is habitual in Malaysia, where it is quite a common surname, Singapore, where it is quite a rare surname, and South Korea, where it is a rare surname. In absolute terms, the name is most common in Malaysia, Indonesia, and South Korea. Very seldom, Wui is the forename as well as the last name.