Last name Nikolaĭ (Николай 
, Nikolaĭ) , in all the world, is a common family name. The last name Nikolaĭ 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). Measured by absolute frequency, this name is the most popular in Russia, Kyrgyzstan, and Bulgaria. Much more frequently, Nikolaĭ is the forename as well as the last name.