In Croatia, Ciko families are Croats (from Kastel Sucurac ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek.
Prevalence
About 10 people with faimily name Ciko live in Croatia today, in five households only. There were 20 of them in the middle of the past century, and their number halved. They are located in four Croatian cities only: in Zagreb (<10), Split (<5), Sibenik (<5), and in Kastel Sucurac (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1943 in source Directorium ARCHI-DIOECESI ZAGREBIENSI.