Ištvanović families are Croats and they are mostly from Krizevci. In the past century, relatively most of Croatian residents bearing this family name were born in Krizevci and Zagreb. In Ruševac in Krizevci every fourth inhabitant had the family name Ištvanović.
Prevalence
About 250 people with faimily name Ištvanović live in Croatia today, in 110 households. They are located in the most of Croatian counties, in 16 cities and 31 other places, mostly in Virovitica (30), Zagreb (25), Rusevac (15), Koprivnica (15), and in Krizevci (10).
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.