Protrka families are Croats and they are mostly from Herzegovina. In the past century, relatively most of Croatian residents bearing this family name were born in Herzegovina (Posusje area) and in Imotsko.
Prevalence
About 240 people with faimily name Protrka live in Croatia today, in 90 households. There were 70 of them in the middle of the past century, and their number more than tripled. They are located in the most of Croatian counties, in 21 cities and 17 other places, mostly in Zagreb (50), Imotski (35), Zmijavci in Imotski area (35), Split (30), and in Slavonski Brod (<10).
Outside Croatia
Family name Protrka is present in four countries on two continents. The family name "Protrka " is used by 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.