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.