Last name Kozjek (Kozjek 
) , in the world, is a rare surname. The surname Kozjek is characteristic of Slovenia, where it is quite a common surname, Sierra Leone, where it is quite a rare surname, and North Macedonia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Slovenia, Sierra Leone, and France. Much less frequently, Kozjek is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kozjek | Sierra Leone, France, Slovenia, Germany, North Macedonia |
| franc kozjek SI (b. 1938) |
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| pavle kozjek Slovenian mountaineer, SI (b. 1959) |
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| nada rotovnik kozjek Slovene sports medicine physician, SI (b. 1963) |
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| jure kozjek Slovene ice hockey player (1982-), SI (b. 1982) |
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| maša kozjek SI (b. 1974) |
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| dominik kozjek SI |
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| tatjana kozjek SI (b. 1980) |
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| marko kozjek SI |
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Mr, Dejan, David, Diane, Laura, Neža, Mateja, Monika, Simona, Albert, Denis, Andrew, Klemen, Robert, Tadeja, Nellie, Matjaž, Dominik, Gašper, Katarina, Kristina, Ashley, Nicholas, Klara, Blaž, Ms, Rok, Gea, Ales, Anja, Anze, Kaja, Gaã, Lara, Kelly, Luka, Jure, Nada, Neza, Nejc, Hans, Marko, Miran, Sandi, Sonja, Jaka, and Bernadette