Ištvan families are Croats and they are mostly from Koprivnica. In the past century, relatively most of Croatian residents bearing this family name were born in Koprivnica and Vinkovci.
Prevalence
About 100 people with faimily name Ištvan live in Croatia today, in 40 households. There were 140 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 6 Croatian counties, in 8 cities and 9 other places, mostly in Koprivnica (40), Vinkovci (20), Molve in Djurdjevac area (15), Gat (<10), and in Secerana (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1928 in source Emigration Commission Zagreb.