Cognomen Rainov (Rainov 
, Райнов 
) , across the world, is a rare surname. The cognomen Rainov is habitual in Eastern Europe, particularly Bulgaria, where it is quite a rare surname, Ukraine, where it is a rare surname, and Russia. Also, Rainov is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rainov | Russia, Mexico, Bulgaria, Brazil, Democratic Republic of the Congo |
| Райнов | Kazakhstan, Russia, Belarus, Bulgaria, Ukraine |