Pernjek families are Croats and they are mostly from Krapina. In the past century, relatively most of Croatian residents bearing this family name were born in Krapina and Zagreb.
Prevalence
About 150 people with faimily name Pernjek live in Croatia today, in 60 households. There were 90 of them in the middle of the past century, and their number increased by 60 percent. They are located in 7 Croatian counties, in 11 cities and 14 other places, mostly in Zagora (30), Krapina (25), Donji Macelj in Krapina area (20), Podgora Krapinska (15), and in Zagreb (15).
Outside Croatia
At least two families with this surname emigrated from Croatia to the United States (1) and Germany (1). Family name Pernjek is present in two countries on two continents.
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.