Surname ไวยฤทธิ์ (Waiyarit 
, ไวยฤทธิ์ , Wairit ) , around the globe, is a rare family name. The last name ไวยฤทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, ไวยฤทธิ์ is the forename as well as the last name.