Family name Zeff (泽夫 
, Zeff 
, ゼフ) , in the entire world, is a rare surname. The surname Zeff is habitual in the United States, where it is a rare surname, the United Kingdom, and Australia, where it is a very rare surname. In absolute terms, it most frequently occurs in the United States, China, and Indonesia. Likewise, Zeff is the forename as well as the last name.
| VARIANT | COUNTRY |
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| 泽夫 | China |
| Zeff | Kenya, United Kingdom, United States, Indonesia, South Africa |
| edward zeff British spy, GB (b. 1904) |
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| leo zeff American psychologist (1912-1988), US (b. 1912) |
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| paul zeff US (b. 1911) |
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| stephen a. zeff American economist, US (b. 1933) |
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| judith zeff (b. 1928) |
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alexandre zeff FR |
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| eleanor e. zeff (b. 1943) |
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| dan zeff British television director, GB (b. 1953) |
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| claudia zeff (b. 1956) |
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| jonathan zeff independent policy and strategy consultant; Director, Zeff Associates Ltd, since 2017 (b. 1966) |
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| mrs phyllis margaret zeff Chairman, New Zealand Family Planning Association, 1950s; recipient of a New Zealand Suffrage Medal 1993, NZ |
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