Cognomen Košnik (Košnik 
) , in the entire world, is a very rare surname. The surname Košnik is characteristic of Southern Europe, particularly Slovenia, where it is quite a rare surname, and Croatia, where it is a very rare surname.
| irena grošelj košnik Slovenian politician, SI (b. 1957) |
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| miha košnik badminton player, SI (b. 1968) |
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| mitja košnik researcher |
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| nejc košnik Slovene physicist, SI |
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| jure košnik Slovene ice hockey player (1985-), SI (b. 1985) |
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| mitja košnik SI |
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| irena grmek-košnik SI |
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| roman košnik SI |
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| petra košnik SI |
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| anže košnik Slovenian footballer, SI (b. 1991) |
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