Jež families are almost entirely Croats and they are mostly from Ludbreg , barely Bosniaks. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Ludbreg. In Šopron in Varazdinske Toplice area every ninth inhabitant had the family name Jež.
Prevalence
About 230 people with faimily name Jež live in Croatia today, in 100 households. There were 250 of them in the middle of the past century, and their number decreased by 10 percent. They are located in the most of Croatian counties, in 20 cities and 27 other places, mostly in Zagreb (55), Sopron in Varazdinske Toplice area (15), Ludbreg (15), Stari Grabovac (10), and in Breganica (10).
Outside Croatia
Family name Jež (including: Yez , Jez , Jezza and Jezzi ) is present in 45 countries worldwide. The family name "Jez " is used by some 2000 people in Poland , about 300 in the United States , and some 100 people in France. "Jezzi " is used by small number of people in Italy and small number in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.