Zorko families are Croats and they are mostly from Zapresic area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Varazdin. In Bukovica Prekriška in Jastrebarsko area every sixth inhabitant had the family name Zorko.
Prevalence
About 350 people with faimily name Zorko live in Croatia today, in 160 households. There were 450 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 31 cities and 44 other places, mostly in Zagreb (70), Jakovlje in Zapresic area (30), Varazdin (25), Krizevci (15), and in Voloder in Kutina area (15).
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.