In Croatia, Hrelec families are almost entirely Croats (from Zagreb ), barely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Bjelovar.
Prevalence
About 60 people with faimily name Hrelec live in Croatia today, in 20 households. There were 50 of them in the middle of the past century, and their number increased by 0 percent. They are located and two other Croatian places, mostly in Zagreb (15), Odranski Obrez (15), Novi Marof (<10), Gudovac (<10), and in Medsave (<5).
Outside Croatia
Family name Hrelec is present in three countries on two continents. The family name "Hrelec " 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.