Blaž families are Croats and they are mostly from middle Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Vitez area) and in Middle Bosnia (Travnik area).
Prevalence
About 40 people with faimily name Blaž live in Croatia today, in 18 households. There were 50 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 9 Croatian counties, in 12 cities and 6 other places, mostly in Karlovac (15), Viskovci (10), Zagreb (<5), Knin (<5), and in Split (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.