In Croatia, Ivačko families are Croats (from Virovitica ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Djurdjevac area.
Prevalence
About 10 people with faimily name Ivačko live in Croatia today, in five households only. There were 20 of them in the middle of the past century, and their number halved. They are located in two Croatian counties, two cities and four other places, mostly in Samobor (<5), Virovitica (<5), Gradina in Virovitica area (<5), Farkasevec Samoborski (<5), and in Suhopolje in Virovitica area (<5).
Outside Croatia
Family name Ivačko (including: Ivacko , Ivachko and Ivachnko ) is present in 9 countries on three continents. The family name "Ivacko " 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 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.