In Croatia, Blaj families are Croats (from Pula ). In the past century, relatively most of Croatian residents bearing this family name were born in Pula and Karlovac.
Prevalence
About 10 people with faimily name Blaj live in Croatia today, in 8 households. There were 20 of them in the middle of the past century, and their number halved. They are located in 8 Croatian counties, in 7 cities and two other places, mostly in Pula (<10), Karlovac (<10), Zagreb (<5), Drenje Scitarjevsko (<5), and in Velika Gorica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.