Cognomen พัชฤทธิ์ (พัชฤทธิ์ 
, Pachrit ) , around the world, is an extremely rare last name. The cognomen พัชฤทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Likewise, พัชฤทธิ์ is the forename as well as the last name.