In Croatia, Slosar families are Croats (from Opatija area ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and Opatija.
Prevalence
About 30 people with faimily name Slosar live in Croatia today, in 17 households. There were 10 of them in the middle of the past century, and their number tripled. They are located in two Croatian counties, threee cities and four other places, mostly in Rijeka (20), in Klana (<10) and Mucici (<5) in Opatija area, Opatija (<5), and in Matulji in Opatija area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.