Šostar families are Croats and they are mostly from Pozega. In the past century, relatively most of Croatian residents bearing this family name were born in Pozega and Zagreb.
Prevalence
About 70 people with faimily name Šostar live in Croatia today, in 30 households. They are located in the most of Croatian counties, in 10 cities and 6 other places, mostly in Pozega (15), Ferdinandovac in Djurdjevac area (10), Zagreb (<10), Pula (<10), and in Knin (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.