In Croatia, Omašić families are almost entirely Croats (from Kastel Sucurac ), barely Montenegrins (also from Kastel Sucurac ). In the past century, relatively most of Croatian residents bearing this family name were born in Split and Kastel Sucurac.
Prevalence
About 50 people with faimily name Omašić live in Croatia today, in 20 households. There were 30 of them in the middle of the past century, and their number increased by 40 percent. They are located in four Croatian counties, four cities and 5 other places, mostly in Kastel Luksic (30), Sibenik (10), Kastel Gomilica (<10), Zagreb (<5), and in Sinj (<5).
Outside Croatia
Family name Omašić (including: Omasic , Omasich ) is present in three countries on two continents. "Omasich " is used by few 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 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.