Last name ريثي (Rethy 
, Rithy 
, ريثي 
) , all over the world, is quite a rare cognomen. The cognomen ريثي is habitual in Hungary, where it is quite a rare surname, Cambodia, and Belgium, where it is a rare surname. Also, ريثي is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rethy | Indonesia, Hungary, Cambodia, United States, India |
| Rithy | Cambodia, United States, India, France, Democratic Republic of the Congo |
| ريثي | Saudi Arabia |