Surname ฤทัยพงศ์ (ฤทัยพงศ์ 
, Ruthaiphong ) , all over the world, is an extremely rare cognomen. The surname ฤทัยพงศ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Also, ฤทัยพงศ์ is the forename as well as the last name.