Cognomen ถกลธรรม (Thakontham 
, ถกลธรรม , Thakoltham ) , throughout the world, is a very rare family name. The last name ถกลธรรม is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, ถกลธรรม is the forename as well as the last name.