Family name Руб (Rub 
, Roub 
, Руб 
) , in all the world, is quite a common surname. The cognomen Руб is characteristic of Switzerland, where it is quite a rare surname, United Arab Emirates, and Czechia. In absolute terms, it is commonest in India, Bangladesh, and the United States. Likewise, Руб is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rub | Indonesia, United States, Pakistan, Bangladesh, India |
| Roub | Indonesia, United States, Bangladesh, Saudi Arabia, India |
| Руб | Armenia, Ukraine, Russia, Kazakhstan |