In Croatia, Reljković families are generally Croats (from Slavonski Brod area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Slavonski Brod area and in Slavonski Brod.
Prevalence
About 30 people with faimily name Reljković live in Croatia today, in 9 households. There were 20 of them in the middle of the past century, and their number increased by 10 percent. They are located in four Croatian counties, four cities and four other places, mostly in Zagreb (<10), in Trnjani (<10) and Klokocevik (<10) in Slavonski Brod area, Petrovec in Petrinja area (<5), and in Sisak (<5).
Outside Croatia
Family name Reljković is present in this form only in Croatia.
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.