Ferko families are Croats and they are mostly from Cazma area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Karlovac.
Prevalence
About 110 people with faimily name Ferko live in Croatia today, in 40 households. There were 120 of them in the middle of the past century, and their number decreased by 0 percent. They are located in 7 Croatian counties, in 9 cities and 26 other places, mostly in Donji Dragonozec (25), Jastrebarsko (<10), Vivodina (<10), Karlovac (<10), and in Ivancani in Cazma area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1926 in source Emigration Commission Zagreb.