Cognomen Tomnov (Tomnov 
, Томнов 
) , all over the world, is a very rare family name. The cognomen Tomnov is characteristic of Israel, where it is a very rare surname, Russia, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Tomnov | Russia, Israel |
| Томнов | Russia, Ukraine |