Cognomen Kosjek (Kosjek 
) , in all the world, is a very rare family name. The cognomen Kosjek is habitual in Slovenia, where it is quite a rare surname, Croatia, where it is a rare surname, and Austria.
| VARIANT | COUNTRY |
|---|---|
| Kosjek | United States, Austria, Croatia, Slovenia, Germany |
|
gustav von kosjek Austrian diplomat (1838-1897), AT (b. 1838) |
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| rosalia maria kosjek AT (b. 1847) |
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| tina kosjek researcher |
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| birgit kosjek researcher |
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| tina kosjek SI (b. 1977) |
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