Mikolaj families are Croats and they are mostly from Cakovec. In the past century, relatively most of Croatian residents bearing this family name were born in Cakovec and Koprivnica.
Prevalence
About 170 people with faimily name Mikolaj live in Croatia today, in 70 households. There were 20 of them in the middle of the past century, and their number multiplied. They are only located in in 6 Croatian cities and 23 other places, mostly in Kristanovec (40), Koprivnica (15), Ziskovec (15), Cakovec (15), and in Mursko Sredisce (10).
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.