Family name ธรรมชัยเดช (Thumchaidech 
, ธรรมชัยเดช ) , worldwide, is a very rare last name. The cognomen ธรรมชัยเดช is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, ธรรมชัยเดช is the forename as well as the last name.