Cognomen Mannhardt (Mannhardt 
) , worldwide, is a rare last name. The family name Mannhardt is habitual in Germany, where it is a rare surname, Canada, where it is a very rare surname, and New Zealand. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Canada.
| VARIANT | COUNTRY |
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| Mannhardt | Canada, Brazil, France, United States, Germany |
| franz xaver mannhardt (1696-1773) (b. 1696) |
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johann wilhelm mannhardt DE (b. 1760) |
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johann mannhardt German clockmaker, DE (b. 1798) |
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wilhelm mannhardt German scholar, DE (b. 1831) |
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julius mannhardt German ophthalmologist (1834-1893), DE (b. 1834) |
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| wilhelm mannhardt (b. 1800) |
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| johannes mannhardt (b. 1840) |
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| hermann gottlieb mannhardt (b. 1855) |
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renate mannhardt German actress (1920-2013), DE (b. 1920) |
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| johann wilhelm mannhardt German sociologist and political scientist, DE (b. 1883) |
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jürgen mannhardt German military personnel, DE (b. 1954) |
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bernd mannhardt German writer, DE (b. 1961) |
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| carsten mannhardt German architect (1930-2020), DE (b. 1930) |
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ludwig mannhardt German skeleton racer, DE (b. 1999) |
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| clara mannhardt researcher (ORCID 0000-0002-0007-6780) |
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