In Croatia, Kočka families are predominantly Croats (from the Island of Korcule ), very rarely Bosniaks (from Umag ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Split.
Prevalence
About 20 people with faimily name Kočka live in Croatia today, in 10 households. There were 10 of them in the middle of the past century, and their number doubled. They are located and two other Croatian places, mostly in Vela Luka on the Island of Korcula (<10), Rijeka (<5), Slavonski Brod (<5), Crveni Vrh (<5), and in Osijek (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.