Surname Kless (Kless 
, Клесс 
, קלס 
) , around the world, is quite a rare cognomen. The surname Kless is habitual in Israel, where it is a rare surname, Germany, and the United States. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Russia. Much less frequently, Kless is the forename as well as the last name.
| johann kless German theologian, DE (b. 1669) |
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| johanna kless DE (b. 1677) |
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| friedrich kless German general and Knight's Cross recipient, DE (b. 1906) |
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| achim kless researcher |
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| oliver kless |
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