Mrazović families are Croats and they are mostly from Novi Marof area. According to some sources they are from Kalnik mountain area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Novi Marof area.
Prevalence
About 390 people with faimily name Mrazović live in Croatia today, in 150 households. There were 360 of them in the middle of the past century, and their number increased by 10 percent. They are located in the most of Croatian counties, in 21 cities and 56 other places, mostly in Zagreb (55), Breznicki Hum in Novi Marof area (45), Bedenica in Sveti Ivan Zelina area (30), Bjelovar (20), and in Vidovec in Varazdin area (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.