Kalember families are mainly Serbs and they are mostly from Otocac area , whereas often Croats. In the past century, relatively most of Croatian residents bearing this family name were born in Otocac area and in Zagreb. In Bjelopolje in Otocac area every seventh inhabitant had the family name Kalember.
About 90 people with faimily name Kalember live in Croatia today, in 50 households. There were 110 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 9 Croatian counties, in 11 cities and 10 other places, mostly in Zagreb (30), Osijek (<10), Gospic (<10), and in Oravac (<10) and Korenica (<10) in Otocac area.
Family name Kalember is present in 10 countries on three continents. The family name "Kalember " is used by some 100 people in the United States , small number in Germany , and small number of people in Canada.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.