In Croatia, Bučko families are mainly Rusyns (from Ilok area ), rarely Croats (from Vukovar ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Vukovar and in Ilok area.
Prevalence
About 50 people with faimily name Bučko live in Croatia today, in 20 households. There were 90 of them in the middle of the past century, and their number decreased by 50 percent. They are only located in in 8 Croatian cities and two other places, mostly in Miklusevci in Ilok area (20), Vukovar (15), Zagreb (<10), Petrovci in Vukovar area (<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.