Cognomen Флесс (Fless 
, Флесс 
) , around the globe, is a rare family name. The family name Флесс is characteristic of Norway, where it is a rare surname, Germany, where it is a very rare surname, and Russia. In absolute terms, it is the most numerous in Germany, Russia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Fless | Canada, Germany, United States, Norway |
| Флесс | Russia |