In Croatia, Janjak families are Croats (from Omis area ). In the past century, relatively most of Croatian residents bearing this family name were born in Split.
Prevalence
Only a few people with faimily name Janjak live in Croatia today, in two households only. There were 10 of them in the middle of the past century, and their number decreased significantly. They are located in only two Croatian places: in Katuni in Omis area (<5) and Split (<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.