Kljenak families are Croats and they are mostly from Imotski area. In the past century, relatively most of Croatian residents bearing this family name were born in Imotsko and Zagreb.
Prevalence
About 100 people with faimily name Kljenak live in Croatia today, in 40 households. There were 80 of them in the middle of the past century, and their number increased by 20 percent. They are located in 6 Croatian counties, in 9 cities and 6 other places, mostly in Krivodol in Imotski area (25), Zagreb (20), Slavonski Brod (15), Podstrana in Solin area (15), and in Split (<10).
Outside Croatia
Family name Kljenak is present in 6 countries on three continents.
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.