Last name Nickolay (Николай 
, ניקולאי 
, Nickolay 
) , globally, is a common family name. The last name Nickolay is habitual in Kyrgyzstan, where it is a common surname, Bulgaria, where it is quite a common surname, and Armenia (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Russia, Kyrgyzstan, and Bulgaria. Much more frequently, Nickolay is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Николай | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| ניקולאי | Israel |
| Nickolay | Germany, Kazakhstan, Russia, Bulgaria, Ukraine |
| nickolay kurlantsev Russian mathematician (b. 1802) |
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| nickolay budaev Russian mathematician (b. 1833) |
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| nickolay hristiani Russian mathematician (1834-1891) (b. 1834) |
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| nickolay mihelson Russian mathematician (b. 1873) |
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| friedrich nickolay German politician (1909-1953), DE (b. 1909) |
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| nickolay volodin Russian politician, RU (b. 1936) |
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| nickolay chaklein Russian politician, RU (b. 1943) |
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| nickolay gurevich (b. 1939) |
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| nickolay fyodorov Russian politician, RU (b. 1958) |
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| nickolay korabel researcher (ORCID 0000-0001-7208-4555) (b. 1977) |
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| nickolay v lavrik researcher |
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| nickolay a krotkov researcher |
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| nickolay brustovetsky researcher (ORCID 0000-0002-6564-2560) |
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| nickolay s melik-nubarov researcher |
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| nickolay lamm American illustrator, US |
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