Cognomen ดุลยรัตน์ (ดุลยรัตน์ 
) , across the world, is a very rare last name. The cognomen ดุลยรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. More frequently, ดุลยรัตน์ is the forename as well as the last name.