Cognomen แก้วเทศ (Kaeothet 
, แก้วเทศ, Kaewthet ) , all over the world, is a very rare family name. The surname แก้วเทศ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, แก้วเทศ is the forename as well as the last name.