Kučko families are Croats and they are mostly from Zabok area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zabok area. In Sekirišće in Zabok area every eighth inhabitant had the family name Kučko.
Prevalence
About 430 people with faimily name Kučko live in Croatia today, in 170 households. There were 400 of them in the middle of the past century, and their number increased by 10 percent. They are located in 10 Croatian counties, in 17 cities and 44 other places, mostly in Zagreb (115), Vidovec in Varazdin area (40), in Sekirisce (30) and Sveti Kriz Zacretje (25) in Zabok area, and in Planina Gornja (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.