Family name ฤทธิ์วัฒน์ (ฤทธิ์วัฒน์ 
) , all over the world, is an extremely rare cognomen. The cognomen ฤทธิ์วัฒน์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Likewise, ฤทธิ์วัฒน์ is the forename as well as the last name.