Last name Carnahan (Carnahan 
) , around the globe, is quite a common surname. The surname Carnahan is habitual in the United States, where it is quite a rare surname, Bahrain, and New Zealand. Not in comparison with a country's population, this name is the most popular in the United States, Canada, and Taiwan.
| VARIANT | COUNTRY |
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| Carnahan | Taiwan, Australia, United States, New Zealand, Canada |
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james carnahan American academic administrator, US (b. 1775) |
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j. p. carnahan American Professor, US (b. 1832) |
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| robert h. carnahan Union Army general (b. 1821) |
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h. l. carnahan Lieutenant Governor of California, 1928–1931, US (b. 1879) |
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a. s. j. carnahan American politician (1897-1968), US (b. 1897) |
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jean carnahan American politician, US (b. 1933) |
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mel carnahan Governor of Missouri (1934-2000), US (b. 1934) |
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russ carnahan American politician, US (b. 1958) |
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robin carnahan American government official, US (b. 1961) |
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joe carnahan American actor, director and producer, US (b. 1969) |
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| howard l. carnahan agronomist (1920-2011), US (b. 1920) |
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jennifer carnahan former chair of the Minnesota Republican Party, KR (b. 1976) |
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edmund m. carnahan scientist at The Dow Chemical Company in Freeport, Texas |
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| norman f. carnahan American chemical engineer (b. 1942) |
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| scott carnahan American tennis player (b. 1953) |
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