In Croatia, Runjajić families are Croats by relative majority, equally Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Knin area and in Knin. In Oton in Knin area every nintieth inhabitant had the family name Runjajić.
Prevalence
Only a few people with faimily name Runjajić live in Croatia today, in five households only. There were 20 of them in the middle of the past century, and their number halved. They are located in four Croatian counties, threee cities and another small place , mostly in Blato on the Island of Korcula (<5), Hrvatska Kostajnica (<5), Vinkovci (<5), and in Trogir (<5).
Outside Croatia
Family name Runjajić is present in five countries on two continents. The family name "Runjajic " is used by few people in Italy and few people in the United States.
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.