In Croatia, Jerkovac families are Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and Petrinja.
Prevalence
About 20 people with faimily name Jerkovac live in Croatia today, in 6 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Kriz Hrastovacki (<10), Gornje Komarevo (<10), Sisak (<5), and in Petrinja (<5).
Outside Croatia
Family name Jerkovac is present in this form only in Croatia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.