Mandek families are Croats and they are mostly from Banja Luka area (Bosnia). In the past century, relatively most of Croatian residents bearing this family name were born in Banja Luka Region, Bosnia (Banja Luka area) and in Vinkovci. In Zablatje Posavsko in Velika Gorica every third inhabitant had the family name Mandek.
Prevalence
About 90 people with faimily name Mandek live in Croatia today, in 40 households. There were 80 of them in the middle of the past century, and their number increased by 20 percent. They are located in 10 Croatian counties, in 11 cities and 12 other places, mostly in Vinkovci (25), Zagreb (15), Velika Gorica (<10), Varazdin (<10), and in Opatija (<10).
Outside Croatia
Family name Mandek is present in 11 countries on four continents. "Mandeck " is used by few 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.