Mrazek families are usually Croats and they are mostly from Ivanec , rarely Czechs (from Pakrac ). In the past century, relatively most of Croatian residents bearing this family name were born in Ivanec and Zagreb.
Prevalence
About 90 people with faimily name Mrazek live in Croatia today, in 40 households. There were 130 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 10 Croatian counties, in 10 cities and 12 other places, mostly in Radovan (15), Zagreb (15), Varazdin (10), Pozega (<10), and in Kriz in Ivanic-Grad area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.