Family name Nikolaev (Николаев 
, Nikolaev 
, 尼古拉耶夫 
) , around the world, is a widespread last name. The family name Nikolaev is habitual in Eastern Europe, particularly Russia, where it is quite a common surname, Bulgaria, and Belarus (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Russia, Kazakhstan, and Bulgaria.
| VARIANT | COUNTRY |
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| Николаев | Ukraine, Kazakhstan, Belarus, Russia, Azerbaijan |
| Nikolaev | Uzbekistan, Belarus, Bulgaria, Russia, United States |
| 尼古拉耶夫 | China |
| ניקולאייב | Israel |
Nikolajev, Nikolajevs, Nikolajew, Nikolayev, Nikolaïev, Nikołajew, Александрович, Васильевич, and Ніколаев
| aleksandr nikolaev Russian politician (b. 1868) |
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| k. n. nikolaev Russian lawyer (1884-1965) (b. 1884) |
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andrei nikolaev Russian Paralympic swimmer, silver medallist in the Men's 100 metre freestyle S8 in 2020 |
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| mikhail nikolaev (b. 1926) |
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| georgiy vladimirovich nikolaev Russian entomologist, RU (b. 1942) |
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| ivan nikolaev Soviet association football player (1946-2001), RU (b. 1946) |
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| semen nikolaev (b. 1936) |
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| evgeny nikolaev researcher (b. 1947) |
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daniil nikolaev sportsperson, RU |
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| vladimir nikolaev Soviet association football player, AZ (b. 1955) |
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| petr nikolaev Czech-French film director and screenwriter, CZ (b. 1957) |
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| aliosha nikolaev Soviet composer (b. 1959) |
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| anatolij prokopevich nikolaev RU (b. 1949) |
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| evgeny nikolaev chess player (b. 1959) |
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| alexey nikolaev chess player (b. 1960) |
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