Surname สุพรรณกาญจน์ (Ratjinan 
, สุพรรณกาญจน์ , Supanakan ) , all around the world, is an extremely rare last name. The family name สุพรรณกาญจน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, สุพรรณกาญจน์ is the forename as well as the last name.