Family name กุลบูรณ์ (กุลบูรณ์ 
, Kulboon , Kulaboon ) , around the world, is a very rare last name. The last name กุลบูรณ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, กุลบูรณ์ is the forename as well as the last name.