Cognomen Fernis (Fernis 
) , all around the world, is a very rare surname. The cognomen Fernis is characteristic of Germany, where it is a very rare surname, Nicaragua, and Venezuela. Not in comparison with a country's population, it is the most numerous in Germany, Venezuela, and the United States. Very seldom, Fernis is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fernis | Philippines, United States, South Africa, Venezuela, Germany |
| otto fernis (b. 1848) |
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| hans-georg fernis German historian of modern age, DE (b. 1910) |
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philipp fernis DE (b. 1982) |
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emma ekenman fernis Swedish handball player, SE (b. 1996) |
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