Širović families are Croats and they are mostly from Sinj. In the past century, relatively most of Croatian residents bearing this family name were born in Sinj and Split.
Prevalence
About 90 people with faimily name Širović live in Croatia today, in 30 households. There were 30 of them in the middle of the past century, and their number tripled. They are located in only five naselja i to in Obrovac Sinjski (60), Split (25), Zagreb (<10), Sesvete (<5), and in Sinj (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.