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, Nicolae, Nikolay, Nicolai | Germany, Bulgaria, Denmark, Romania, Moldova |
| Nikolaj | Germany, Belarus, Bulgaria, Denmark, United States |
| Niculae | Germany, Spain, United States, Romania, Moldova |
| Nicolay | Germany, Bulgaria, Denmark, United States, Romania |
| Nickolai | Germany, Bulgaria, Denmark, United States, Moldova |
| نيكولاي | Iraq, Palestinian Territory, Yemen |
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.