In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia.
Prevalence
About 10 people with faimily name Petkovšek live in Croatia today, in 0 households. There were 10 of them in the middle of the past century, and their number remains constant. They are located in one Croatian city only, in Rijeka (<5).
Outside Croatia
Family name Petkovšek is present in three countries on two continents. The family name "Petkovsek " is used by some 400 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 1926 in source Emigration Commission Zagreb.