Cognomen ฤทธิ์มณี (ฤทธิ์มณี 
) , all around the world, is a very rare last name. The last name ฤทธิ์มณี is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, ฤทธิ์มณี is the forename as well as the last name.