Cognomen Klaehn (Klaehn 
) , in all the world, is a rare surname. The family name Klaehn is characteristic of Germany, where it is a rare surname, Canada, and the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Klaehn | Canada, Australia, Italy, Germany, United States |
| theodor klaehn DE (b. 1883) |
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| friedrich joachim klaehn German writer (1895-1969), DE (b. 1895) |
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| percy klaehn Canadian politician, CA (b. 1896) |
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| jutta boerker-klaehn (b. 1942) |
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| john r klaehn researcher |
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| chris klaehn college basketball player (1991–1993) Tennessee |
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| karsten klaehn |
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