Last name ธัญญกรณ์ (ธัญญกรณ์ 
, Tanyakran ) , around the world, is an extremely rare cognomen. The family name ธัญญกรณ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more frequently, ธัญญกรณ์ is the forename as well as the last name.