Cognomen Barnhart (Barnhart 
, Барнхарт 
) , across the world, is a common family name. The last name Barnhart is habitual in the United States, where it is quite a rare surname, Canada, and New Zealand, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Canada, and Germany.
| VARIANT | COUNTRY |
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| Barnhart | Germany, United Kingdom, United States, Canada, New Zealand |
| Барнхарт | Russia, Ukraine |
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henry a. barnhart American politician (1858-1934), US (b. 1858) |
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| dorothy barnhart (born 1809) (b. 1809) |
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harry horner barnhart American choir director, US (b. 1874) |
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clyde barnhart American baseball player (1895-1980), US (b. 1895) |
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| john hendley barnhart American botanist (1871-1949), US (b. 1871) |
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| berta r. barnhart (b. 1880) |
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| harry j. barnhart American football and basketball coach (1890-1961), US (b. 1890) |
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gordon barnhart Canadian civil servant, CA (b. 1945) |
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phil barnhart American politician, US (b. 1946) |
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jo anne b. barnhart American politician, US (b. 1950) |
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| clarence barnhart American lexicographer, US (b. 1900) |
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| edgar barnhart American baseball player, US (b. 1904) |
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| les barnhart American baseball player (1905-1971), US (b. 1905) |
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| dan barnhart NFL player (1912-1965), US (b. 1912) |
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| thomas f. barnhart (b. 1902) |
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