Surname สำแดงฤทธิ์ (สำแดงฤทธิ์, Samdangrit 
) , throughout the world, is a very rare last name. The family name สำแดงฤทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Samdangrit | Thailand |