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Last name ยิ้มแฉ่ง (Yimsaeng , ยิ้มแฉ่ง, Yimumphai ) , all over the world, is a rare cognomen. The surname ยิ้มแฉ่ง is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, ยิ้มแฉ่ง is the forename as well as the last name.