Cognomen ศรีธัญญารัตน์ (ศรีธัญญารัตน์ 
, Sreetunyarat, Sritathanyarat) , all around the world, is an extremely rare family name. The family name ศรีธัญญารัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.