Cognomen Koralnik (Koralnik 
) , in the entire world, is a very rare surname. The surname Koralnik is habitual in Switzerland, where it is a rare surname, Israel, where it is a very rare surname, and Argentina, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Switzerland, Israel, and the United States. Likewise, Koralnik is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Koralnik | Israel, United Kingdom, Switzerland, Poland, United States |
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igor j. koralnik physician, neurologist and scientist from the United States |
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| pierre koralnik French film director, FR (b. 1938) |
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| igor j koralnik researcher (ORCID 0000-0001-6836-1468) |
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