Librenjak families are Croats and they are mostly from Sinj. In the past century, relatively most of Croatian residents bearing this family name were born in Sinj and Nova Gradiska.
Prevalence
About 100 people with faimily name Librenjak live in Croatia today, in 30 households. There were 60 of them in the middle of the past century, and their number increased by 70 percent. They are located in four Croatian counties and two other places, mostly in Karakasica (35), Zagreb (20), Sinj (20), Split (15), and in Nova Gradiska (<10).
Outside Croatia
Family name Librenjak is present in three countries on three continents. The family name "Librenjak " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1937 in source Emigration Commission Zagreb.