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