Jezernik families are Croats and they are mostly from Mursko Sredisce. According to some sources they are from Sivici near Cakovec. In the past century, relatively most of Croatian residents bearing this family name were born in Cakovec and Mursko Sredisce. In Križovec in Mursko Sredisce every twentieth inhabitant had the family name Jezernik.
Prevalence
About 160 people with faimily name Jezernik live in Croatia today, in 60 households. There were 80 of them in the middle of the past century, and their number doubled. They are located in 9 Croatian counties, in 10 cities and 19 other places, mostly in Sivica in Mursko Sredisce area (20), Cakovec (15), Vratisinec in Mursko Sredisce area (15), Krizovec (15), and in Mihovljan (<10).
Outside Croatia
Family name Jezernik is present in 10 countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1924 in source Emigration Commission Zagreb.