In Croatia, Orešek families are Croats (from Koprivnica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Koprivnica and in Koprivnica area.
Prevalence
Only a few people with faimily name Orešek live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number halved. They are only located in in one Croatian city and another small place , mostly in Koprivnica (<10) and Peteranec in Koprivnica area (<5).
Outside Croatia
Family name Orešek 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 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.