In Croatia, Drinjak families are generally Croats (from Podrinje (Bosnia) ), very rarely Serbs, and barely Bosniaks (from Valpovo area ). In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Livno area) and in Osijek. In Obrvena in Podrinje (Bosnia) every second inhabitant had the family name Drinjak.
Prevalence
About 40 people with faimily name Drinjak live in Croatia today, in 20 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in 7 Croatian counties, in 7 cities and 6 other places, mostly in Osijek (25), Njivice on the Island of Krk (<10), Zagreb (<5), Lipik (<5), and in Dobrovac (<5).
Outside Croatia
Family name Drinjak is present in five countries on three continents. The family name "Drinjak " is used by small number of people in the United States.