In Croatia, Nikolajev families are Croats (from Kosovo ). In the past century, relatively most of Croatian residents bearing this family name were born in Kosovo.
Prevalence
Only a few people with faimily name Nikolajev live in Croatia today, in two households only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in only two Croatian places: in Bregi (<5) and Matulji (<5) in Opatija area.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.