In Croatia, Blaha families are predominantly Croats (from Bjelovar ), rarely Czechs (from Daruvar area ), and very rarely Slovenes (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Bjelovar.
Prevalence
About 40 people with faimily name Blaha live in Croatia today, in 16 households. There were 50 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 6 Croatian counties, in 6 cities and 5 other places, mostly in Zagreb (10), Dezanovac in Daruvar area (<10), Gudovac (<10), Osijek (<10), and in Zdralovi (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1933 in source Emigration Commission Zagreb.