Eršeg families are Croats and they are mostly from Varazdin area. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Koprivnica. In Žigrovec in Varazdin area every tenth inhabitant had the family name Eršeg.
Prevalence
About 80 people with faimily name Eršeg live in Croatia today, in 40 households. There were 80 of them in the middle of the past century, and their number remains constant. They are located in 6 Croatian counties and 12 other places, mostly in Varazdin (20), in Sveti Ilija (20), Beretinec (10) and Turcin (<10) in Varazdin area, and in Peteranec in Koprivnica area (<10).
Outside Croatia
Family name Eršeg (including: Herseg , Erseg ) is present in three countries on two continents. "Herseg " is used by small number of 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 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.