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Cognomen ต้นคำ (Tonkham , Tonkam , ต้นคำ) , throughout the world, is a rare last name. The cognomen ต้นคำ is habitual in Cameroon, where it is quite a rare surname, Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. In absolute terms, it is the most numerous in Cameroon, Thailand, and the United States. Also, ต้นคำ is the forename as well as the last name.