Last name ถิรรัตน์ (Tirarat 
, ถิรรัตน์ , Tirunrat ) , across the world, is an extremely rare surname. The last name ถิรรัตน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, ถิรรัตน์ is the forename as well as the last name.
จูเลิศตระกูล, and มณีกุล