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