Family name สมวรรณ (สมวรรณ 
, Somwan 
) , across the world, is a rare last name. The family name สมวรรณ is characteristic of Thailand, where it is quite a rare surname, Hungary, where it is a very rare surname, and the United States, where it is an extremely rare surname. Likewise, สมวรรณ is the forename as well as the last name.