Surname Jarnagin (Jarnagin 
) , around the world, is quite a rare family name. The surname Jarnagin is habitual in the United States, where it is a rare surname, Canada, where it is a very rare surname, and New Zealand. Measured by absolute frequency, it is commonest in the United States, Canada, and Venezuela.
| VARIANT | COUNTRY |
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| Jarnagin | Venezuela, United States, India, Canada, Philippines |
| thomas jarnagin (b. 1746) |
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| mary witt jarnagin (b. 1753) |
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| richard c. jarnagin American chemist, US (b. 1930) |
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| chuck jarnagin college basketball player (1953–1954) Iowa |
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| william r jarnagin researcher |
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| milton preston jarnagin, jr. Ph.D. Duke University 1949 |
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