Cognomen Kyosov (Kyosov 
, Киосов 
) , all around the world, is a rare family name. The family name Kyosov is habitual in Eastern Europe, particularly Bulgaria, where it is quite a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kyosov | Bulgaria |
| Киосов | Russia, Ukraine |