In Croatia, Seper families are predominantly Croats (from Dubrovnik area ), rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Sibenik and Dubrovnik.
Prevalence
About 20 people with faimily name Seper live in Croatia today, in 8 households. There were 30 of them in the middle of the past century, and their number decreased by 20 percent. They are located in only five naselja i to in Plocice in Dubrovnik area (<10), Sibenik (<5), Velika Gorica (<5), Vodice (<5), and in Sonkovic (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.