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