Osmak families are Croats and they are mostly from Pakrac. In the past century, relatively most of Croatian residents bearing this family name were born in Pakrac and Zagreb.
Prevalence
About 70 people with faimily name Osmak live in Croatia today, in 30 households. There were 60 of them in the middle of the past century, and their number increased by 20 percent. They are located in 7 Croatian counties, in 8 cities and 5 other places, mostly in Zagreb (25), Pakrac (10), Kusonje (<10), Maglenca in Bjelovar area (<10), and in Delnice (<10).
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.