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Last name ธรรมวรรณ (ธรรมวรรณ , Thumwan , Khammawan ) , in the entire world, is a rare cognomen. The last name ธรรมวรรณ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, ธรรมวรรณ is the forename as well as the last name.