Čirko families are Croats and they are mostly from western Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Tomislavgrad area) and in Western Bosnia (Livno area). In Rašeljke in Western Bosnia every third inhabitant had the family name Čirko.
Prevalence
About 160 people with faimily name Čirko live in Croatia today, in 50 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in 6 Croatian counties, in 11 cities and 9 other places, mostly in Zagreb (60), Pleternica (35), Stobrec (15), Pozega (<10), and in Kastel Sucurac (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.