Surname Klinefelter (Klinefelter 
) , in all the world, is quite a rare family name. The cognomen Klinefelter is characteristic of the United States, where it is a rare surname, Canada, where it is a very rare surname, and New Zealand. In absolute terms, it is the most numerous in the United States, Philippines, and Canada.
| VARIANT | COUNTRY |
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| Klinefelter | Canada, Philippines, New Zealand, United Kingdom, United States |
| henry g. klinefelter 19th century American politician, US (b. 1843) |
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| walter klinefelter (b. 1899) |
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| harry klinefelter endocrinologist, US (b. 1912) |
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| donald s. klinefelter (b. 1937) |
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| zachary klinefelter researcher |
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