All over the world, Ніколай (Николай 
, Nicolaj 
, Ніколай ) is a prevalent masculine given name. The forename Ніколай is habitual in Russia, where it is a prevalent masculine name, Kazakhstan, and Bulgaria, where it is a common masculine name (explore the name in all countries). Much less frequently, Ніколай is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Николай | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Nicolaj | Germany, Sweden, Romania, Italy, Denmark |
| Ніколай | Ukraine |
Mikalai, Mikalaj, Mikalay, Mikałaj, Miklavž, Miklos, Miklós, Mikola, Mikołaj, Mikuláš, Mikławš, Mykola, Mykoła, Niccolò, Nicholas, Nickel, Nicolaas, Nicolae, Nicolaes, Nicolas, Nicolau, Nicolay, Nicolino, Nicolo, Nicolás, Nicolò, Nicos, Nicu, Niels, Nikolai, Nikolai, Nikolaj, Nikolaj, Nikolajs, Nikolajus, Nikolao, Nikolaos, Nikolas, Nikolass, Nikolaus, Nikolay, Nikolaz, Nikolaï, Nikolos, Nikoloz, Nikos, Nikołaj, Nikulás, Nils, Nyikolaj, Νίκολας,
Ніколай is also a popular name for the fictitious and mythical characters: Nicholai Zinoviev , the fictional character from the video game series Resident Evil, Resident Evil 3; Nikolai Rostov , the fictional character from War and Peace; Prince Nikolay Bolkonsky , the father of Prince Andrey Bolkonsky, War and Peace; Nikolai Sergueych Ikhmenev , the character from Dostoyevsky's Humiliated and Insulted and Nikolai Orelov , the Assassin’s Creed character, Assassin's Creed, and in many other works.
Куц, Тумас, Радльмаєр, Фанін, Фисун, Чижик, Юзвяк, Каіпецький, Мільман, Беззуб, Поттер, Власєнко, Костін, Мітрік, Перчик, Іванов, Новіков, Романов, Колєснік, Гончаров, Шевченко, Мірошніков, Тодос, Семаан, Енскат, Отлєв, Кущ, Кутя, Брук, Веля, Кужик, Мержа, Можак, Мороз, Аулов, Биков, Бондаренко, Буров, Ганжа, Гур'Єв, Грисюк, Граур, Двігун, Носов, Лукян, Львов, Жадан, Орлов, Бружа, and Завгородній