Bosek families are Croats and they are mostly from Krapina area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Krapina area.
Prevalence
About 80 people with faimily name Bosek live in Croatia today, in 30 households. There were 90 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 6 Croatian counties, in 8 cities and 9 other places, mostly in Zagreb (35), Cerje Jesenjsko in Krapina area (25), Kalnik in Varazdinske Toplice area (<10), Krizevci (<10), and in Bale in Rovinj area (<10).