Cognomen Руофф (Ruoff 
, Руофф 
) , around the globe, is quite a rare last name. The cognomen Руофф is characteristic of Bermuda, where it is quite a common surname, Germany, where it is quite a rare surname, and Switzerland. In absolute terms, it is the most numerous in Germany, the United States, and Switzerland. Much less frequently, Руофф is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ruoff | Germany, United Kingdom, Switzerland, United States, Brazil |
| Руофф | Russia, Belarus |