Cognomen Mckeithen (Mckeithen 
) , all around the world, is quite a rare family name. The cognomen Mckeithen is characteristic of Jamaica, where it is a rare surname, the United States, and New Zealand. In absolute terms, it is commonest in the United States, Thailand, and Jamaica. Much less frequently, Mckeithen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mckeithen | Jamaica, United States, New Zealand, Thailand, Canada |
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john mckeithen American governor of Louisiana (1918-1999), US (b. 1918) |
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| w. fox mckeithen American politician (1946-2005), US (b. 1946) |
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| anne mckeithen author, journalist, and librarian of Charlottesville, Virginia, US (b. 1946) |
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| madge mckeithen (b. 1955) |
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| tre mckeithen college basketball player (2017–2018) Saint Francis (PA) |
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