Family name Klag (Klag 
, 克拉格 
) , around the world, is quite a rare last name. The family name Klag is characteristic of Poland, where it is a rare surname, Germany, and Latvia. Measured by absolute frequency, it is the most numerous in Germany, Poland, and the United States. Likewise, Klag is the forename as well as the last name.
| walter klag AT (b. 1922) |
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| michael j. klag American internist and epidemiologist (b. 1952) |
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| peter klag German association football player, DE (b. 1952) |
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| walter klag AT (b. 1949) |
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| nadine klag German association football player, DE |
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| kendra a klag researcher (ORCID 0000-0001-5237-8628) |
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| carl klag |
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| volker klag |
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| karl-heinz klag |
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