In Croatia, Omčikus families are predominantly Serbs, rarely Croats (from Koprivnica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Knin area and in Knin. In Radučić in Knin area every seventh inhabitant had the family name Omčikus.
Prevalence
About 40 people with faimily name Omčikus live in Croatia today, in 30 households. There were 120 of them in the middle of the past century, and their number decreased significantly. They are located in 7 Croatian counties and 6 other places, mostly in Raducic in Knin area (30), Split (<10), Knin (<5), Vintijan in Pula area (<5), and in Zagreb (<5).
Outside Croatia
Family name Omčikus is present in 7 countries on three continents. The family name "Omcikus " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.