Čvrljak families are Croats and they are mostly from Sibenik. In the past century, relatively most of Croatian residents bearing this family name were born in Sibenik and Skradin. In places Čvrljevo and Konjevrate in Sibenik every ninth inhabitant had the family name Čvrljak.
Prevalence
About 140 people with faimily name Čvrljak live in Croatia today, in 60 households. There were 110 of them in the middle of the past century, and their number increased by 30 percent. They are located in 6 Croatian counties, in 9 cities and four other places, mostly in Sibenik (80), Zadar (15), Zagreb (10), Split (<10), and in Cvrljevo (<10).
Outside Croatia
Family name Čvrljak is present in three countries on two continents. The family name "Cvrljak " is used by few people in Switzerland and few people in the United States.
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.
