In Croatia, Ajder families are mainly Serbs, equally Croats (from Ogulin area ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Middle Bosnia (Kiseljak area). In Šahinovići in Middle Bosnia every ninth inhabitant had the family name Ajder.
Prevalence
About 20 people with faimily name Ajder live in Croatia today, in 9 households. They are located in four Croatian counties, threee cities and four other places, mostly in Dedin (10), Zagreb (<10), Lokve in Delnice area (<5), Delnice (<5), and in Gomirje (<5).