Cognomen Harndt (Harndt 
) , throughout the world, is a rare surname. The cognomen Harndt is habitual in Germany, where it is a rare surname, Brazil, where it is an extremely rare surname, and Argentina.
| VARIANT | COUNTRY |
|---|---|
| Harndt | Germany, Argentina, Brazil, United States |
| ewald harndt German dentist, DE (b. 1901) |
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| thomas harndt (b. 1932) |
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| thomas harndt (b. 1932) |
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