Cognomen ฤทัยพันธ์ (Ruthaipun 
, Rutaphan , ฤทัยพันธ์ ) , all over the world, is a very rare surname. The family name ฤทัยพันธ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, ฤทัยพันธ์ is the forename as well as the last name.