Plazanić families are Croats and they are mostly from western Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Livno area) and in Slavonski Brod.
Prevalence
About 190 people with faimily name Plazanić live in Croatia today, in 60 households. There were 70 of them in the middle of the past century, and their number more than doubled. They are located in the most of Croatian counties, in 12 cities and 14 other places, mostly in Sesvete (40), Slavonski Brod (25), Zagreb (20), Osijek (20), and in Stari Mikanovci in Djakovo area (20).
Outside Croatia
Family name Plazanić 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 2007 in source Encyclopaedia of Croatian Surnames.