In Croatia, Kucko families are Croats (from Sisak area ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak area and in Sisak.
Prevalence
Only a few people with faimily name Kucko live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number decreased significantly. They are located in only two naselja i to in Sisak (<5) and Sela (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.