Family name Kljenak (Kljenak 
) , in the entire world, is a rare last name. The cognomen Kljenak is habitual in Croatia, where it is quite a rare surname, Slovenia, where it is a rare surname, and Argentina.
| VARIANT | COUNTRY |
|---|---|
| Kljenak | Slovenia, Argentina, Canada, Croatia |
| mladen kljenak (b. 1933) |
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| mladen kljenak SI (b. 1965) |
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| ivo kljenak Slovene physicist, SI |
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| jan david kljenak SI |
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Ana, Diana, Tenna, Elena, Erica, Vesna, Filip, Ivica, Oscar, Marija, Marcos, Mislav, Mladen, Silvia, Andrea, Carlos, Ramiro, Robert, Dragan, Lucija, Josefa, Jelena, Damir, Nikša, David, Petar, Mira, Sara, Alen, Ante, Rosa, Dora, Juan, Nina, Nora, Ivan, Omar, Maria, Mario, Mateo, Milan, Sally, Alina, Antun, Carla, Klara, Petra, Pedro, and Hector