In Croatia, Ozvačić families are almost entirely Croats (from Krapina area ), barely Slovenes, and . In the past century, relatively most of Croatian residents bearing this family name were born in Krapina area and in Zagreb.
Prevalence
About 50 people with faimily name Ozvačić live in Croatia today, in 20 households. There were 30 of them in the middle of the past century, and their number increased by 60 percent. They are located and four other Croatian places, mostly in Mala Erpenja in Krapina area (15), Zagreb (10), Ivanic-Grad (<10), Umag (<5), and in Sveti Kriz in Klanjec area (<5).
Outside Croatia
Family name Ozvačić is present in 6 countries on four continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.