In Croatia, Širec families are almost entirely Croats (from Djurdjevac area ), very rarely Slovenes (from Slovenia ). In the past century, relatively most of Croatian residents bearing this family name were born in Djurdjevac area and in Koprivnica. In Ferdinandovac in Djurdjevac area every seventieth inhabitant had the family name Širec.
Prevalence
About 40 people with faimily name Širec live in Croatia today, in 19 households. There were 20 of them in the middle of the past century, and their number doubled. They are located in 6 Croatian counties and 5 other places, mostly in Ferdinandovac in Djurdjevac area (25), Djurdjevac (<10), Zagreb (<5), Novo Virje in Djurdjevac area (<5), and in Bjelovar (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.