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