Cognomen จำนงฤทธิ์ (Jumnongrit 
, จำนงฤทธิ์, Jamnongrit ) , in the world, is a very rare last name. The family name จำนงฤทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, จำนงฤทธิ์ is the forename as well as the last name.