In Croatia, Dijak families are Croats (from Virovitica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Virovitica. In Turanovac in Virovitica area every nintieth inhabitant had the family name Dijak.
Prevalence
About 30 people with faimily name Dijak live in Croatia today, in 14 households. There were 70 of them in the middle of the past century, and their number decreased significantly. They are located in 6 Croatian counties, threee cities and 9 other places, mostly in Zagreb (10), Gornji Stupnik in Samobor area (<5), Osijek (<5), and in Kapela Dvor (<5) and Brezik (<5) in Virovitica area.
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.