Širola families are Croats and they are mostly from Rijeka area. In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and Zagreb. In Viškovo in Rijeka area every fifth inhabitant had the family name Širola.
Prevalence
About 350 people with faimily name Širola live in Croatia today, in 170 households. There were 460 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 9 Croatian counties, in 17 cities and 38 other places, mostly in Rijeka (115), Zagreb (30), Viskovo in Rijeka area (30), Pula (25), and in Marinici in Rijeka area (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over forty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.