Cognomen Gernhardt (Gernhardt 
) , all over the world, is quite a rare surname. The last name Gernhardt is habitual in Croatia, where it is quite a rare surname, Germany, and Austria, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Brazil. Much less frequently, Gernhardt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gernhardt | Brazil, United States, Germany, Austria, Croatia |
| ludwig gernhardt German author and historian, DE (b. 1882) |
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robert gernhardt German artist (1937-2006), DE (b. 1937) |
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| robert gernhardt Estonian lawyer (b. 1899) |
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| armin gernhardt (b. 1889) |
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michael l. gernhardt NASA astronaut and manager of Environmental Physiology Laboratory, US (b. 1956) |
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| barbara gernhardt (b. 1904) |
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| leopold gernhardt Association footballer (1920-2013), AT (b. 1920) |
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| horst gernhardt German association football player (1923-1994), DE (b. 1923) |
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| klaus gernhardt (b. 1938) |
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| almut gernhardt (b. 1940) |
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| per gernhardt DE (b. 1941) |
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| thorsten gernhardt German taekwondo practitioner, DE (b. 1965) |
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| matthias michael gernhardt DE (b. 1960) |
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| marvin gernhardt researcher (ORCID 0000-0002-2893-883X) |
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| wilhelm gernhardt |
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