Cognomen รุ่งกาญจน์ (Rungkan 
, Rungkarn , Roongkarn ) , all around the world, is a very rare last name. The last name รุ่งกาญจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more frequently, รุ่งกาญจน์ is the forename as well as the last name.