In Croatia, Šijuk families are predominantly Serbs, rarely Croats (from Sisak ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Ilok area and in Vukovar.
Prevalence
Only a few people with faimily name Šijuk live in Croatia today, in four households only. There were 40 of them in the middle of the past century, and their number decreased significantly. They are located in only four naselja i to in Gornji Hrastovac (<5) and Sunja (<5) in Hrvatska Kostajnica area, Orolik in Vinkovci area (<5), and in Donji Lapac in Obrovac area (<5).