Surname Engelhardt (Engelhardt 
, Энгельгардт 
, אנגלהרדט 
) , in the entire world, is a common family name. The cognomen Engelhardt is characteristic of Curacao, where it is quite a common surname, Germany, and Denmark, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Germany, the United States, and Brazil. Very seldom, Engelhardt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Engelhardt | Germany, Austria, Brazil, United States, Denmark |
| Энгельгардт | Russia, Kyrgyzstan, Kazakhstan |
| אנגלהרדט | Israel |
Engel'Gardt, Engelgardt, Engelhard, Engelhart, Englehardt, Енгелгардт, Енгелхардт, Енгельгардт, Енгельхардт, and Энгельгарт
| hans heinrich engelhardt Swiss engraver (1557-1612), CH (b. 1557) |
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| johann engelhardt (b. 1609) |
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| dorothea barbara engelhardt (b. 1615) |
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| johann christoph engelhardt (b. 1621) |
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| michael engelhardt DE (b. 1650) |
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| michael wilhelm engelhardt (b. 1671) |
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nikolay bogdanovich engelhardt Russian civil servant (b. 1737) |
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| heinrich christoph engelhardt SE (b. 1694) |
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| caspar friedrich von engelhardt (b. 1699) |
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grigori engelhardt Russian Army general (b. 1759) |
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yekaterina von engelhardt Russian lady-in-waiting (b. 1761) |
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niels engelhardt Norwegian judge (1777-1863), NO (b. 1777) |
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charlotte engelhardt French writer (1781-1863), FR (b. 1781) |
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| mårten fredrik von engelhardt Swedish musician, SE (b. 1734) |
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| wilhelm heinrich von engelhardt (b. 1726) |
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