In the entire world, نيكولاي (Nicolae 
, Nikolay , Nikolai , along with others...) is a widespread male forename. The first name نيكولاي is habitual in Eastern Europe, particularly Romania, where it is a widespread male name, Moldova, and Bulgaria, where it is a common masculine name (explore the name in all countries). Much less frequently, نيكولاي is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Nikolai, Nicolai, Nicolae, Nikolay | Moldova, Bulgaria, Romania, Denmark, Germany |
| Nikolaj | Bulgaria, Belarus, United States, Denmark, Germany |
| Niculae | Moldova, Spain, Romania, United States, Germany |
| Nicolay | Bulgaria, Romania, United States, Denmark, Germany |
| Nickolai | Moldova, Bulgaria, United States, Denmark, Germany |
| نيكولاي | Yemen, Iraq, Palestinian Territory |
Mikalai, Mikalaj, Mikalay, Mikałaj, Miklos, Miklós, Mikola, Mikołaj, Mikuláš, Mykola, Mykoła, Neculache, Neculai, Niccolai, Niccolò, Nicholae, Nicholai, Nicholas, Nickel, Nicolaas, Nicolaes, Nicolas, Nicolau, Nicolaus, Nicoli, Nicolo, Nicolás, Nicolò, Nicos, Niculaie, Niels, Nikoiai, Nikola, Nikolai, Nikolaj, Nikolajs, Nikolajus, Nikolao, Nikolaos, Nikolas, Nikolass, Nikolaus, Nikolaz, Nikolaï, Nikos, Nikołaj, Nils, Nyikolaj, Νίκολας, Νίκος, Νικολάου,
نيكولاي 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.