Cognomen หทัยวัฒน์ (หทัยวัฒน์ 
, Hathaiwat , Hattaiwat) , in the world, is a very rare family name. The surname หทัยวัฒน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, หทัยวัฒน์ is the forename as well as the last name.