In Croatia, Jeras families are generally Croats (from Nin area ), rarely Slovenes (from Slovenia ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Nin area.
Prevalence
About 40 people with faimily name Jeras live in Croatia today, in 20 households. There were 40 of them in the middle of the past century, and their number remains constant. They are only located in four Croatian cities and 6 other places, mostly in Zagreb (15), Split (<10), Rijeka (<10), Ljubac in Nin area (<10), and in Kosi in Rijeka area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1925 in source Emigration Commission Zagreb.