In Croatia, Mroček families are Croats (from Pleternica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Pleternica area and in Pozega.
Prevalence
About 10 people with faimily name Mroček live in Croatia today, in four households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only five naselja i to in Osijek (<10), Caglin in Pleternica area (<10), Pozega (<5), Rusevo in Pleternica area (<5), and in Vidovci (<5).