Smolko families are Croats and they are mostly from Dugo Selo area. In the past century, relatively most of Croatian residents bearing this family name were born in Dugo Selo area and in Zagreb.
Prevalence
About 40 people with faimily name Smolko live in Croatia today, in 18 households. There were 70 of them in the middle of the past century, and their number decreased by 50 percent. They are located in threee Croatian counties, threee cities and four other places, mostly in Oborovo (15) and Rugvica (<10) in Dugo Selo area, Dugo Selo (<10), Sesvete (<10), and in Sisak (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.