Surname ตรีวรรณ (ตรีวรรณ 
, Treewan 
, Threerawan ) , in all the world, is a very rare cognomen. The last name ตรีวรรณ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, ตรีวรรณ is the forename as well as the last name.