Išek families are Croats and they are mostly from Glina area. In the past century, relatively most of Croatian residents bearing this family name were born in Glina and Sisak. In places Golinja , Cerje Pokupsko and Hrvatsko Selo in Glina area every seventh inhabitant had the family name Išek.
Prevalence
About 260 people with faimily name Išek live in Croatia today, in 120 households. There were 360 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 9 Croatian counties, in 12 cities and 36 other places, mostly in Zagreb (30), Sisak (30), Velika Gorica (25), and in Golinja (20) and Topusko (20) in Glina area.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.