Cognomen Ehrhardt (Ehrhardt 
, ארהרדט 
, Эрхардт) , in the world, is a common last name. The last name Ehrhardt is habitual in Western Europe, particularly Germany, where it is quite a common surname, France, where it is quite a rare surname, and Switzerland. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and France. Much less frequently, Ehrhardt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ehrhardt | Germany, Switzerland, France, Brazil, United States |
| ארהרדט | Israel |
| johann jacob ehrhardt (b. 1609) |
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| benjamin friedrich ehrhardt (b. 1714) |
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| christian jakob ehrhardt (b. 1721) |
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| sigmund just ehrhardt (b. 1733) |
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| friedrich wilhelm ehrhardt DE (b. 1752) |
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adolf ehrhardt German painter (1813-1899), DE (b. 1813) |
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heinrich ehrhardt German inventor and entrepreneur (1840-1928), DE (b. 1840) |
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| johann karl friedrich von ehrhardt DE (b. 1789) |
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| johann heinrich wilhelm ehrhardt (b. 1794) |
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| johann heinrich ehrhardt German inventor, DE (b. 1805) |
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ernst ehrhardt German architect, DE (b. 1855) |
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| friedrich gustav ehrhardt Originally German, from 1834 in Switzerland, legal consultant of Nordostbahn, CH (b. 1812) |
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hermann ehrhardt German Freikorps commander, DE (b. 1881) |
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| andreas ehrhardt (b. 1823) |
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rube ehrhardt American baseball player, US (b. 1894) |
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