Last name ฤทธี (ฤทธี 
, Rithi 
, Rittee ) , in all the world, is a rare family name. The last name ฤทธี is characteristic of Thailand, where it is a rare surname, Kenya, and Bangladesh. Also, ฤทธี is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ฤทธี | Thailand |
| Rithi | Bangladesh, Kenya, Thailand, United States, India |
| Rittee | Thailand, United States |
| Ritthi | United States, Thailand, India |