Klen families are Croats and they are mostly from Ivanec area. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and in Ivanec area. In Jurketinec in Ivanec area every tenth inhabitant had the family name Klen.
Prevalence
About 200 people with faimily name Klen live in Croatia today, in 80 households. There were 130 of them in the middle of the past century, and their number increased by 50 percent. They are located in the most of Croatian counties, in 18 cities and 22 other places, mostly in Varazdin (30), Zagreb (25), Jurketinec in Ivanec area (25), Jarmina in Vinkovci area (20), and in Osijek (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.