Slavulj families are podjednako Croats (the family name originates from Banja Luka area , Bosnia) and Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Hrvatska Kostajnica area and in Banja Luka Region, Bosnia (Banja Luka area). In places Gvozdansko and Šakanlije in Hrvatska Kostajnica area every ninth inhabitant had the family name Slavulj.
Prevalence
About 140 people with faimily name Slavulj live in Croatia today, in 70 households. There were 100 of them in the middle of the past century, and their number increased by 50 percent. They are located in 10 Croatian counties, in 12 cities and 26 other places, mostly in Zagreb (35), Gudci (10), Gvozdansko in Hrvatska Kostajnica area (10), Kutina (<10), and in Osijek (<10).
Outside Croatia
Family name Slavulj is present in 9 countries on four continents.
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.