Cognomen Кнйазев (Knyazev 
, Kniazev 
, Кнйазев ) , in the entire world, is quite a rare surname. The last name Кнйазев is habitual in Estonia, where it is quite a rare surname, Malta, and Russia. Not in comparison with a country's population, the name is most common in Russia, Belarus, and Uzbekistan. Very seldom, Кнйазев is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Knyazev | Uzbekistan, Russia, Estonia, Belarus, United States |
| Kniazev | China, Russia, Spain, Belarus, United States |
| Кнйазев | Russia |
| Knjazev | Germany, Russia, Estonia, Belarus, United States |