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 | Kenya, United States, Thailand, India, Bangladesh |
| Rittee | United States, Thailand |
| Ritthi | India, United States, Thailand |