Surname Kotnik (Kotnik 
) , around the globe, is quite a rare family name. The last name Kotnik is habitual in Slovenia, where it is a common surname, Croatia, where it is quite a rare surname, and Austria. Not in comparison with a country's population, it is the most numerous in Slovenia, the United States, and Germany. Much less frequently, Kotnik is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kotnik | Sierra Leone, United States, Germany, Austria, Slovenia |
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france kotnik Slovenian ethnologist, literary historian and journalist (1882-1955), SI (b. 1882) |
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karel kotnik SI (b. 1875) |
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ciril kotnik Yugoslav diplomat of Slovene ethnicity (1895-1948), SI (b. 1895) |
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| franc kotnik Slovenian businessman born 1871, SI (b. 1871) |
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| janko kotnik SI (b. 1885) |
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| ivan kotnik (b. 1889) |
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| viktor kotnik SI (b. 1910) |
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| jaroslav kotnik SI (b. 1914) |
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| stanko kotnik Slovenian professor of Slavic studies, SI (b. 1928) |
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| josip kotnik (b. 1923) |
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gloria kotnik Slovenian snowboarder (1989-), SI (b. 1989) |
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| rudolf kotnik SI (b. 1931) |
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| vladimir kotnik Slovene immunologist, SI (b. 1949) |
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| rudi kotnik Slovene philosopher, SI (b. 1953) |
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| irena kotnik Slovenian politician, SI (b. 1955) |
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