In Croatia, Nikolaj families are predominantly Albanians (from Kastav ), rarely Croats (from Crikvenica ). In the past century, relatively most of Croatian residents bearing this family name were born in Kosovo and in Rijeka.
Prevalence
About 10 people with faimily name Nikolaj live in Croatia today, in four households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only threee naselja i to in Kastav (15), Lovran in Opatija area (<10), and in Selce (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1932 in source Emigration Commission Zagreb.