There is also the German variation Joschka. Most famous bearer would be Joschka Fischer, German foreign minister from 1998 to 2005. While his official name was Joseph, the nickname Joschka is now an officially acknowledged first name in Germany. [noted -ed]
― Anonymous User 8/5/2017
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Joško and Joška are Croatian variants (as diminutives of Josip). [noted -ed]