Surname Грунов (Грунов 
, Grunov 
) , across the world, is a rare cognomen. The surname Грунов is habitual in Eastern Europe, particularly Bulgaria, where it is quite a rare surname, Russia, where it is a very rare surname, and Ukraine. Not in comparison with a country's population, it is the most numerous in Bulgaria, Russia, and Brazil.
| VARIANT | COUNTRY |
|---|---|
| Грунов | Kazakhstan, Russia, Ukraine |
| Grunov | Russia, Brazil, Bulgaria, United States |