Surname รุจิธรรมกุล (Rujithamkul 
, รุจิธรรมกุล , Ruchithamkul) , around the world, is a very rare family name. The cognomen รุจิธรรมกุล is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, รุจิธรรมกุล is the forename as well as the last name.