Cognomen กุศลวัฒน์ (กุศลวัฒน์ 
, Kusolwat ) , in all the world, is a very rare last name. The last name กุศลวัฒน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, กุศลวัฒน์ is the forename as well as the last name.