Blažanović families are almost entirely Croats and they are mostly from Bosnian Posavina , rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Bosanski Samac area) and in Bosanian Posavina (Gradacac area).
Prevalence
About 360 people with faimily name Blažanović live in Croatia today, in 140 households. There were 40 of them in the middle of the past century, and their number multiplied. They are located in the most of Croatian counties, in 25 cities and 41 other places, mostly in Zagreb (65), in Babina Greda (30) and Slavonski Samac (25) in Zupanja area, Viskovci in Djakovo area (15), and in Osijek (15).
Outside Croatia
Family name Blažanović is present in three countries on two continents. The family name "Blazanovic " is used by some 50 people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.