Klem families are predominantly Croats and they are mostly from Vinkovci area , rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Slavonski Brod and in Vinkovci area.
Prevalence
About 100 people with faimily name Klem live in Croatia today, in 40 households. There were 100 of them in the middle of the past century, and their number remains constant. They are located in 8 Croatian counties, in 15 cities and 10 other places, mostly in Nijemci in Vinkovci area (20), Slavonski Brod (15), Darda in Osijek area (15), Sumece in Pleternica area (15), and in Valpovo (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1929 in source Emigration Commission Zagreb.