Cognomen Barnhardt (Barnhardt 
) , throughout the world, is quite a rare last name. The family name Barnhardt is habitual in the United States, where it is a rare surname, Canada, and New Zealand. Measured by absolute frequency, the name is most common in the United States, Canada, and Poland. Very seldom, Barnhardt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Barnhardt | China, Canada, United States, New Zealand, Poland |
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george columbus barnhardt United States Army general, US (b. 1868) |
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luther e. barnhardt American politician, US (b. 1903) |
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| william horace barnhardt (b. 1903) |
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| robert a. barnhardt American academic administrator (b. 1937) |
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tyler barnhardt American actor, US (b. 1993) |
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| wilton barnhardt American writer, US (b. 1960) |
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| tommy barnhardt American football player, US (b. 1963) |
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| chad barnhardt American football quarterback, US (b. 1976) |
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| tyler barnhardt researcher |
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| j. b. barnhardt Ph.D. University of Florida 1975 |
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| e.a. barnhardt botanist |
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| michael l. barnhardt United States Academic |
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| carmen n barnhardt researcher |
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| walter barnhardt researcher ORCID ID = 0000-0001-8840-6280 |
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