Širol families are Croats and they are mostly from Pazin area. In the past century, relatively most of Croatian residents bearing this family name were born in Pula and in Pazin area. In places Škopljak and Gologorički Dol in Pazin area every fourth inhabitant had the family name Širol.
Prevalence
About 180 people with faimily name Širol live in Croatia today, in 70 households. There were 110 of them in the middle of the past century, and their number increased by 60 percent. They are only located in in 13 Croatian cities and 25 other places, mostly in Pazin (20), Gracisce in Pazin area (20), Pula (15), Pican in Pazin area (15), and in Zagreb (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1923 in source Emigration Commission Zagreb.