Cognomen Князев (Князев 
, Knyazev 
, Kniazev 
) , all over the world, is a common family name. The family name Князев is characteristic of Russia, where it is quite a common surname, Belarus, and Kazakhstan, where it is quite a rare surname.
| VARIANT | COUNTRY |
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| Князев | Kazakhstan, Belarus, Kyrgyzstan, Russia, Ukraine |
| Knyazev | Belarus, Estonia, United States, Russia, Uzbekistan |
| Kniazev | Spain, China, Belarus, United States, Russia |
| Knjazev | Belarus, Estonia, United States, Germany, Russia |
| князев, иван иванович RU (b. 1754) |
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князев, василий васильевич Soviet poet (1887-1937), RU (b. 1887) |
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леонид сергеевич князев Soviet actor (1917-1983), RU (b. 1917) |
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| алексей серапионович князев RU (b. 1874) |
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| георгий князев Russian historian (1887-1969), RU (b. 1887) |
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| князев, михаил семёнович Soviet military personnel, UA (b. 1897) |
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| всеволод гаврилович князев RU (b. 1891) |
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| князев, иван александрович RU (b. 1893) |
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евгений владимирович князев Russian actor (born 1955), RU (b. 1955) |
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князев, борис павлович KZ (b. 1947) |
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андрей владимирович князев Russian-American mathematician, US (b. 1959) |
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князев, александр александрович Russian cellist, RU (b. 1961) |
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| князев, иван александрович Russian boxer, RU (b. 1913) |
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| князев, михаил тихонович RU (b. 1906) |
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| князев, сергей львович RU (b. 1908) |
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