Šijak families are Croats and they are mostly from Koprivnica area. In the past century, relatively most of Croatian residents bearing this family name were born in Koprivnica and in Koprivnica area. In Pustakovec in Koprivnica area every ninth inhabitant had the family name Šijak.
Prevalence
About 130 people with faimily name Šijak live in Croatia today, in 50 households. There were 150 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 8 Croatian counties, in 9 cities and 16 other places, mostly in Koprivnica (40), Zagreb (35), Ilok (15), Starigrad (<10), and in Zbjeg in Pleternica area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.