Last name ตันวรัตน์ (Taunwarat 
, ตันวรัตน์ ) , throughout the world, is a very rare surname. The cognomen ตันวรัตน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, ตันวรัตน์ is the forename as well as the last name.