Family name ธรรมวัต (ธรรมวัต 
, Thamtwat , Thammwat ) , in the entire world, is a very rare last name. The cognomen ธรรมวัต is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, ธรรมวัต is the forename as well as the last name.