In Croatia, Mrazovac families are predominantly Croats (from Djurdjevac area ), rarely Serbs, and very rarely Italians (from Pula area ). In the past century, relatively most of Croatian residents bearing this family name were born in Petrinja and in Djurdjevac area. In Jošavica in Petrinja every ninth inhabitant had the family name Mrazovac.
Prevalence
About 60 people with faimily name Mrazovac live in Croatia today, in 30 households. There were 90 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 7 Croatian counties, in 8 cities and 7 other places, mostly in Zagreb (15), Petrinja (10), Koprivnica (<10), Donja Budicina (<10), and in Rijeka (<5).
Outside Croatia
At least one family with this surname emigrated from Croatia to the United States. Family name Mrazovac is present in four countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.