Ivorek families are Croats and they are mostly from Djurdjevac area. In the past century, relatively most of Croatian residents bearing this family name were born in Djurdjevac area and in Bjelovar.
Prevalence
About 60 people with faimily name Ivorek live in Croatia today, in 30 households. There were 100 of them in the middle of the past century, and their number decreased by 30 percent. They are only located in in 6 Croatian cities and 9 other places, mostly in Zagreb (15), Gornji Mosti in Bjelovar area (<10), Bjelovar (<10), Djurdjevac (<10), and in Hampovica in Djurdjevac area (<10).
Outside Croatia
Family name Ivorek is present in this form only in Croatia.
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.