Širinić families are Croats and they are mostly from Skradin. In the past century, relatively most of Croatian residents bearing this family name were born in Sibenik and Skradin.
Prevalence
About 90 people with faimily name Širinić live in Croatia today, in 40 households. There were 80 of them in the middle of the past century, and their number increased by 10 percent. They are located in 9 Croatian counties, in 13 cities and 10 other places, mostly in Sibenik (20), Zagreb (20), Rupe (10), Zadar (<10), and in Sinj (<10).
Outside Croatia
Family name Širinić is present in this form only in Croatia.
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.