Kajba families are Croats and they are mostly from Pregrada area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Pregrada area. In Hum Košnički in Pregrada area every sixth inhabitant had the family name Kajba.
Prevalence
About 180 people with faimily name Kajba live in Croatia today, in 80 households. There were 160 of them in the middle of the past century, and their number increased by 10 percent. They are located in the most of Croatian counties, in 17 cities and 24 other places, mostly in Zagreb (40), Gora Kosnicka in Pregrada area (15), Djakovo (10), Paucje in Djakovo area (10), and in Rijeka (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.