Cognomen พิชัยยุทธ์ (Pichaiyut 
, พิชัยยุทธ์ , Phichaiyut ) , all over the world, is a rare family name. The family name พิชัยยุทธ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Also, พิชัยยุทธ์ is the forename as well as the last name.