In Croatia, Arko families are almost entirely Croats (from Cabar ), barely Slovenes (from Slovenia ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Koprivnica.
Prevalence
About 40 people with faimily name Arko live in Croatia today, in 20 households. There were 50 of them in the middle of the past century, and their number decreased by 10 percent. They are only located in in 8 Croatian cities and two other places, mostly in Zagreb (20), Koprivnica (<10), Rijeka (<10), Samobor (<5), and in Dugo Selo (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over forty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.