In Croatia, Atvanović families are Croats (from Slavonski Brod area ). In the past century, relatively most of Croatian residents bearing this family name were born in Slavonski Brod area.
Prevalence
About 10 people with faimily name Atvanović 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 two Croatian counties, two cities and another small place , mostly in Klakar in Slavonski Brod area (<10), Slavonski Brod (<5), and in Zagreb (<5).
Outside Croatia
Family name Atvanović 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 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.