Last name Karns (Karns 
) , globally, is quite a rare cognomen. The family name Karns is characteristic of Cayman Islands, where it is quite a common surname, the United States, where it is quite a rare surname, and New Zealand, where it is a rare surname. In absolute terms, it is the most numerous in the United States, Germany, and Canada.
| VARIANT | COUNTRY |
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| Karns | Germany, United States, Canada, Israel, New Zealand |
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verdi karns American composer (1882-1925), US (b. 1882) |
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roscoe karns actor (1891-1970), US (b. 1891) |
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| bill karns American baseball player (1875-1941), US (b. 1875) |
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| harry j. karns American politician, US (b. 1880) |
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| virginia karns American actress (1907-1990), US (b. 1907) |
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| todd karns American actor (1921-2000), US (b. 1921) |
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chris karns American turntablist, US (b. 1979) |
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nathan karns baseball player, US (b. 1987) |
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| john marshall karns (b. 1928) |
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| peter karns former American biathlete, US (b. 1945) |
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| stephen karns American lawyer, US |
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| christina m karns researcher |
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| alexander s karns researcher |
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| rebekah karns researcher |
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| tara e karns researcher |
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