Biško families are Croats and they are mostly from Bosnian Krajina. In the past century, relatively most of Croatian residents bearing this family name were born in Herzegovina (Ljubuski area) and in Bosnian Krajina (Bosanska Dubica area).
Prevalence
About 200 people with faimily name Biško live in Croatia today, in 70 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in the most of Croatian counties, in 19 cities and 16 other places, mostly in Zagreb (65), Imotski (40), Split (20), Bjelovar (15), and in Sesvete (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1926 in source Emigration Commission Zagreb.