Last name ไวยวัฒน์ (ไวยวัฒน์ 
, Vaiyawat , Waiwat 
) , in all the world, is a very rare family name. The surname ไวยวัฒน์ is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, ไวยวัฒน์ is the forename as well as the last name.