Cognomen Riens (Riens 
) , globally, is a rare family name. The family name Riens is characteristic of Germany, where it is a very rare surname, Indonesia, and the United States, where it is an extremely rare surname. Likewise, Riens is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Riens | Germany, Indonesia, Spain, United States, Netherlands |