In Croatia, Koser families are generally Croats (from Djurdjevac ), very rarely Hungarians (from Djakovo ). In the past century, relatively most of Croatian residents bearing this family name were born in Djakovo and Djurdjevac.
Prevalence
About 20 people with faimily name Koser live in Croatia today, in 9 households. There were 60 of them in the middle of the past century, and their number decreased significantly. They are located in only five naselja i to in Severovci (<10), Zagreb (<10), Djakovo (<5), Mursko Sredisce (<5), and in Kavran in Pula area (<5).
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.