Cognomen Riethe (Riethe 
) , throughout the world, is a very rare family name. The cognomen Riethe is habitual in Germany, where it is a very rare surname, France, where it is an extremely rare surname, and the United States. Very seldom, Riethe is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Riethe | Germany, France, Brazil, United States |
| peter riethe German dentist and university teacher, DE (b. 1921) |
|