Last name ธรรมทรัพย์ (ธรรมทรัพย์ 
, Thamsap, Thamsup) , in the world, is a very rare family name. The surname ธรรมทรัพย์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, ธรรมทรัพย์ is the forename as well as the last name.