Surname ฤทธิ์สิริกุล (ฤทธิ์สิริกุล 
) , across the world, is an extremely rare last name. The last name ฤทธิ์สิริกุล is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิ์สิริกุล | Thailand |