In Croatia, Berljak families are Croats (from Prelog ). In the past century, relatively most of Croatian residents bearing this family name were born in Prelog and Cakovec.
Prevalence
About 20 people with faimily name Berljak live in Croatia today, in 10 households. There were 120 of them in the middle of the past century, and their number decreased significantly. They are located in four Croatian counties, four cities and two other places, mostly in Prelog (<10), Draskovec (<10), Koprivnica (<5), Zagreb (<5), and in Cakovec (<5).
Outside Croatia
Family name Berljak is present in 6 countries on two continents. "Berlyak " is used by small number of people in the United States and small number in Ukraine.
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.