Family name ฤทธิ์ณรงค์ (ฤทธิ์ณรงค์ 
) , throughout the world, is a rare last name. The last name ฤทธิ์ณรงค์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. More prevalently, ฤทธิ์ณรงค์ is the forename as well as the last name.