Širac families are Croats and they are mostly from Pakrac. According to some sources they are from Lika. In the past century, relatively most of Croatian residents bearing this family name were born in Pakrac.
Prevalence
About 90 people with faimily name Širac live in Croatia today, in 40 households. There were 90 of them in the middle of the past century, and their number remains constant. They are located in 9 Croatian counties, in 11 cities and threee other places, mostly in Pakrac (35), Prekopakra (20), Zagreb (15), Novska (<5), and in Rijeka (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.