Cognomen Leff (Leff 
, 莱夫 
) , across the world, is quite a rare surname. The surname Leff is characteristic of Namibia, where it is quite a rare surname, the United States, where it is a rare surname, and Israel. Not in comparison with a country's population, it is the most numerous in the United States, France, and Namibia. Very seldom, Leff is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Leff | Namibia, Mexico, United States, Canada, France |
| 莱夫 | China |
| leff pouishnoff Ukrainian musician, GB (b. 1891) |
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enrique leff Mexican economist and sociologist, MX (b. 1946) |
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| sydney leff illustrator, known for sheet music covers (1901-2005), US (b. 1901) |
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| rita leff (b. 1907) |
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| samuel leff (b. 1909) |
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| arthur allen leff American legal scholar (b. 1935) |
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| gordon leff (b. 1926) |
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| julian leff British psychiatrist, GB (b. 1938) |
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| michael leff rhetorician, US (b. 1941) |
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| carol skalnik leff American political scientist (b. 1947) |
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| barbara leff American politician, US (b. 1947) |
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| laurel leff American journalist, academic and author, US (b. 1957) |
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| jonathan w leff researcher |
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| robert leff American businessman, US |
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| nancy leff researcher |
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