In Croatia, Los families are mainly Czechs (from Daruvar area ), equally Croats (from Pakrac ). In the past century, relatively most of Croatian residents bearing this family name were born in Pakrac and Bakar.
Prevalence
About 30 people with faimily name Los live in Croatia today, in 15 households. There were 40 of them in the middle of the past century, and their number decreased by 10 percent. They are located in four Croatian counties, in 6 cities and 5 other places, mostly in Daruvarski Brestovac in Daruvar area (10), Daruvar (<10), Donji Daruvar (<5), Ljudevit Selo (<5), and in Bakar (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.