Čvorak families are Croats and they are mostly from Skradin. In the past century, relatively most of Croatian residents bearing this family name were born in Skradin and Sibenik. In Piramatovci in Skradin every twentieth inhabitant had the family name Čvorak.
Prevalence
About 80 people with faimily name Čvorak live in Croatia today, in 40 households. There were 100 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 9 Croatian counties, in 11 cities and 11 other places, mostly in Sibenik (15), Sisak (<10), Novska (<10), Zagreb (<10), and in Dubrovcan in Zabok area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1923 in source Emigration Commission Zagreb.