Klemenčić families are mainly Croats and they are mostly from Samobor area , rarely Slovenes (from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Samobor area. In Kerestinec in Samobor area every sixth inhabitant had the family name Klemenčić.
Prevalence
About 300 people with faimily name Klemenčić live in Croatia today, in 130 households. There were 340 of them in the middle of the past century, and their number decreased by 10 percent. They are located in almost all Croatian counties, in 24 cities and 30 other places, mostly in Zagreb (75), in Kerestinec (35) and Sveta Nedelja (15) in Samobor area, Varazdin (10), and in Gornji Stupnik in Samobor area (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.