Family name ฤทธิ์ศร (ฤทธิ์ศร 
) , around the globe, is a very rare last name. The family name ฤทธิ์ศร is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, ฤทธิ์ศร is the forename as well as the last name.