In Croatia, Ernjak families are generally Croats (from Biograd na moru area ), very rarely Italians (from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Rijeka.
Prevalence
About 10 people with faimily name Ernjak live in Croatia today, in 11 households. There were 20 of them in the middle of the past century, and their number halved. They are located and two other Croatian places, mostly in Bjelovar (<10), Rijeka (<5), Sibenik (<5), Zagreb (<5), and in Sveti Filip i Jakov in Biograd na moru area (<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.