In Croatia, Cerc families are Croats (from Oroslavje ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Oroslavje.
Prevalence
Only a few people with faimily name Cerc live in Croatia today, in four households only. There were 20 of them in the middle of the past century, and their number halved. They are located in three Croatian cities only: in Zagreb (<5), Oroslavje (<5), and in Donja Stubica (<5).
Outside Croatia
Family name Cerc (including: Cherc , Cherch and Zerz ) is present in 11 countries on four continents. The family name "Cerc " 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 few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.