In Croatia, Strmac families are Croats (from Ozalj area ). In the past century, relatively most of Croatian residents bearing this family name were born in Ozalj area and in Zagreb. In Reštovo Žumberačko in Ozalj area every seventh inhabitant had the family name Strmac.
Prevalence
About 20 people with faimily name Strmac live in Croatia today, in 11 households. There were 70 of them in the middle of the past century, and their number decreased significantly. They are located in four Croatian cities only: in Zagreb (<10), Jastrebarsko (<5), Karlovac (<5), and in Samobor (<5).
Outside Croatia
At least four families with this surname emigrated from Croatia to the United States (3) and Canada (1). Family name Strmac is present in four countries on two continents. The family name "Strmac " is used by some 60 people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.