Cognomen ธัมมาภรณ์ (ธัมมาภรณ์ 
, Thummahorn ) , in the entire world, is a very rare surname. The cognomen ธัมมาภรณ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, ธัมมาภรณ์ is the forename as well as the last name.