Cognomen พนมฤทธิ์ (พนมฤทธิ์ 
, Panomrit ) , worldwide, is a very rare surname. The family name พนมฤทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, พนมฤทธิ์ is the forename as well as the last name.