Family name Граньков (Граньков 
, Grankov 
) , in all the world, is a very rare cognomen. The last name Граньков is habitual in Eastern Europe, particularly Belarus, where it is a very rare surname, Russia, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Граньков | Russia, Belarus |
| Grankov | Russia, Ukraine |