Cognomen Demishev (Demishev 
, Демишев 
) , all around the world, is a rare surname. The surname Demishev is characteristic of Russia, where it is a rare surname, Belarus, and Kazakhstan. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Russia, Ukraine, and Belarus.
| VARIANT | COUNTRY |
|---|---|
| Demishev | Russia, Spain, United States |
| Демишев | Belarus, Russia, Kazakhstan, Ukraine |