Tomasović families are often Croats and they are mostly from Omis. According to some sources they are from Kucice near Omis, and rarely Serbs from Knin area. In the past century, relatively most of Croatian residents bearing this family name were born in Split and Omis. In Kučiće in Omis every fifth inhabitant had the family name Tomasović.
Prevalence
About 600 people with faimily name Tomasović live in Croatia today, in 250 households. There were 620 of them in the middle of the past century, and their number remains constant. They are located in the most of Croatian counties, in 29 cities and 28 other places, mostly in Omis (85), Kucice (85), Split (70), Zagreb (55), and in Podstrana in Solin area (55).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1691 in source Catholic Church Parish Records.