In Croatia, Kozlovac families are Croats (from Jastrebarsko ). In the past century, relatively most of Croatian residents bearing this family name were born in Jastrebarsko and Karlovac. In Brezari in Jastrebarsko every fifth inhabitant had the family name Kozlovac.
Prevalence
About 40 people with faimily name Kozlovac live in Croatia today, in 20 households. There were 80 of them in the middle of the past century, and their number halved. They are located in threee Croatian counties, four cities and 5 other places, mostly in Jastrebarsko (15), Zagreb (<10), Karlovac (<10), Brebrovac (<5), and in Krasic in Jastrebarsko area (<5).
Outside Croatia
Family name Kozlovac is present in three countries on two continents. The family name "Kozlovac " is used by small number of people in the United States and small number in Germany.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.