In Croatia, Sirotnjak families are generally Croats (from Opatija area ), very rarely Italians (from Opatija ), and barely Slovenes (from Opatija area ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and Opatija. In Lovranska Draga in Opatija area every third inhabitant had the family name Sirotnjak.
Prevalence
About 50 people with faimily name Sirotnjak live in Croatia today, in 30 households. There were 60 of them in the middle of the past century, and their number decreased by 20 percent. They are located in two Croatian counties, two cities and 5 other places, mostly in Lovran in Opatija area (35), Pula (<10), Lovranska Draga in Opatija area (<10), Rijeka (<5), and in Viskovo in Rijeka area (<5).