In Croatia, Košorog families are Croats (from Orahovica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Orahovica area and in Cabar. In Tropeti in Cabar every fourth inhabitant had the family name Košorog.
Prevalence
About 30 people with faimily name Košorog live in Croatia today, in 12 households. There were 60 of them in the middle of the past century, and their number halved. They are located and 5 other Croatian places, mostly in Cetekovac in Orahovica area (10), Osijek (<5), Slatina (<5), Mikleus in Orahovica area (<5), and in Zadar (<5).
Outside Croatia
Family name Košorog is present in three countries on three continents. The family name "Kosorog " is used by small number of people in the United States and small number in Australia.
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.