In Croatia, Zelek families are Croats (from Osijek area ). In the past century, relatively most of Croatian residents bearing this family name were born in Beli Manastir area and in Cakovec.
Prevalence
About 10 people with faimily name Zelek live in Croatia today, in 6 households. There were 20 of them in the middle of the past century, and their number halved. They are located in only four Croatian places: in Darda in Osijek area (<10), Dalj in Vinkovci area (<5), Zagreb (<5), and in Hrvatski Leskovac (<5).
Outside Croatia
Family name Zelek (including: Zelech , Zellek and Zelechow ) is present in 25 countries worldwide. The family name "Zelek " is used by some 3000 people in Poland , about 600 in the United States , and some 400 people in Ethiopia.