Batrnek families are Croats and they are mostly from Osijek area. In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and in Osijek area. In Čepin in Osijek area every fiftieth inhabitant had the family name Batrnek.
Prevalence
About 120 people with faimily name Batrnek live in Croatia today, in 50 households. There were 40 of them in the middle of the past century, and their number tripled. They are located in four Croatian counties, four cities and 7 other places, mostly in Cepin in Osijek area (85), Osijek (35), Brtonigla in Buje area (<5), Split (<5), and in Ivanovac in Osijek area (<5).
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.