Cognomen Bolnov (Bolnov 
, Болнов , Больнов 
) , globally, is a rare surname. The family name Bolnov is habitual in Bulgaria, where it is quite a rare surname, Russia, where it is a very rare surname, and Kyrgyzstan. In absolute terms, it is commonest in Bulgaria, Russia, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Bolnov | Bulgaria, Germany, Russia |
| Болнов | Russia |
| Больнов | Kazakhstan, Kyrgyzstan, Russia, Ukraine |