Family name ธรรมกาญจน์ (ธรรมกาญจน์ 
, Tammakarn , Thamkan) , all around the world, is a very rare last name. The last name ธรรมกาญจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, ธรรมกาญจน์ is the forename as well as the last name.