In Croatia, Kalajković families are Croats (from Zagreb ).
Prevalence
Only a few people with faimily name Kalajković live in Croatia today, in one household only. They are located in only one small Croatian place, in Sesvete (<5).
Outside Croatia
Family name Kalajković is present in two countries on two continents. The family name "Kalajkovic " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.