Family name ฤทธิศิลป์ (Ritthisin 
, ฤทธิศิลป์ , Rittisil ) , in the world, is a rare surname. The family name ฤทธิศิลป์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, ฤทธิศิลป์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิศิลป์, Ritthisin, Rittisilp, Rittisil | Thailand |
Power, and Ridthisilpa