Šijaković families are often Croats and they are mostly from east Herzegovina , less frequently Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Vukovar and in East Herzegovina (Trebinje area). In Bjelušine in Podrinje (Bosnia) nearly every inhabitant had the family name Šijaković.
Prevalence
About 170 people with faimily name Šijaković live in Croatia today, in 80 households. There were 140 of them in the middle of the past century, and their number increased by 30 percent. They are located in the most of Croatian counties, in 18 cities and 24 other places, mostly in Zagreb (25), Dubrovnik (20), Tovarnik in Ilok area (20), Vukovar (15), and in Umag (15).
Outside Croatia
Family name Šijaković is present in two countries on two continents. The family name "Sijakovic " is used by small number of people in the United States.
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.