In Croatia, Hergešić families are Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and Zagreb.
Prevalence
About 40 people with faimily name Hergešić live in Croatia today, in 20 households. There were 40 of them in the middle of the past century, and their number remains constant. They are only located in four Croatian cities and 6 other places, mostly in Zagreb (10), Sisak (10), Odra Sisacka (<10), Velika Gorica (<10), and in Sesvete (<5).
Outside Croatia
Family name Hergešić 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 1902 in source Hartmann's General List of Apartments in Zagreb.