Bačko families are mainly Croats and they are mostly from the Island of Lastovo , but often Serbs. In the past century, relatively most of Croatian residents bearing this family name were born on the Island of Lastovo and in Knin area.
Prevalence
About 60 people with faimily name Bačko live in Croatia today, in 30 households. There were 130 of them in the middle of the past century, and their number halved. They are located in 10 Croatian counties, in 11 cities and 8 other places, mostly in Laslovo in Osijek area (10), Uble on the Island of Lastovo (10), Zagreb (<10), Spanat in Slatina area (<10), and in Varazdin (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.