Last name Nikolai (Николай 
, Nikolai 
, ניקולאי 
, along with others...) , around the world, is a common surname. The family name Nikolai is habitual in Armenia, where it is a common surname, Kyrgyzstan, and Bulgaria, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Russia, Kyrgyzstan, and Armenia. Predominantly, Nikolai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Николай | Kazakhstan, Kyrgyzstan, Ukraine, Belarus, Russia |
| Nikolai | Kyrgyzstan, Moldova, Germany, Russia, Bulgaria |
| ניקולאי | Israel |
| Николаи | Kazakhstan, Armenia, Ukraine, Russia, Bulgaria |
| نيكولاي | Palestinian Territory, Iraq, Yemen |
| 尼古拉 | China |
| ニコライ | Japan |
Mikalai, Mikalaj, Mikalay, Mikałaj, Miklavž, Miklos, Miklós, Mikola, Mikołaj, Mikuláš, Mikławš, Mykola, Mykoła, Niccolò, Nicholas, Nickel, Nicolaas, Nicolae, Nicolaes, Nicolai, Nicolaj, Nicolas, Nicolau, Nicolaus, Nicolay, Nicolaï, Nicolino, Nicolo, Nicolás, Nicolò, Nicos, Nicu, Niels, Niilo, Niko, Nikolai, Nikolaj, Nikolaj, Nikolajs, Nikolajus, Nikolao, Nikolaos, Nikolas, Nikolass, Nikolaus, Nikolay, Nikolaz, Nikolaï, Nikolaĭ, Nikolos, Nikoloz, Nikolái, Nikos, Nikołaj, Nikulás, Nils, Nyikolaj, Νίκολας, Νίκος, Νικολάου, Νικόλαος, Νικόλας, Антонов, Коля, Микалай, Миклош, Микола, Миколай, Микулаш, Мыкола, Мікалай, Міклаш, Мікола, Некрасов, Никель, Никколо, Нико, Никола, Николае, Николаев, Николаз, Николайс, Николайъ, Николаос, Николас, Николау, Николаус, Николаэ, Николо, Николоз, Николя, Никос, Никоьлай, Нилс, Нильс, Нйколай, Носков, Нікалас, Нікало, Ніколай, Ніколас, Ніколаі, Ніколаї, Нільс, נילס, ניקולאו, ניקולס, ميخائيل, نيقولا, نيقولاس, نيقولاي, نيكوس, نيكولا, نيكولاس, نيلز, نيلس, ნიკოლასი, ნიკოლოზ, ニコ, ニコラ, ニコラウス, ニコラス, ニルス, ノト, 尼克斯, 尼古拉斯, 尼古拉耶夫, 尼尔斯, 尼柯, 尼科, and 니콜라
| anna nikolai (b. 1561) |
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| hans sebastian nikolai DE (b. 1750) |
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| maria pavlovna nikolai (b. 1812) |
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| august robert nikolai DE (b. 1887) |
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| august nikolai (b. 1906) |
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| fritz nikolai association football player (b. 1925) |
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| norbert nikolai DE (b. 1929) |
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| carsten nikolai (b. 1965) |
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| tomas nikolai researcher (b. 1976) |
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| alexander nikolai AT (b. 1970) |
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| karl august friedrich nikolai German artist (active 18th century?) |
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| jennifer nikolai dance researcher and associate professor at Auckland University of Technology in New Zealand |
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| mirjam nikolai Estonian basketballer, EE |
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| otto nikolai German pharmacist; provided statement in war crimes investigation of Ludwig Kluettgen |
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| john nikolai college basketball player (1987–1987) Princeton |
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Kolev, Romanov, Lazarov, Todorov, Nikolov, Nikitin, Nielsen, Novikov, Hristov, Vasilev, Mihailov, Stefanov, Stoyanov, Andersen, Atanasov, Belinski, Pedersen, Dimitrov, Georgiev, Naidenov, Nikolaev, Yordanov, Borisov, Kostadinov, Angelov, Smirnov, Popov, Dimov, Iliev, Olsen, Markov, Stoqnov, Asenov, Kostov, Pavlov, Petrov, Petkov, Dobrev, Larsen, Jensen, Hansen, Ivanov, Marinov, Makarov, Müller, Sokolov, Schmidt, Andreev, and Aleksandrov