Cognomen Belfer (Belfer 
, Behelfer , בלפר ) , worldwide, is quite a rare last name. The cognomen Belfer is characteristic of Monaco, where it is quite a common surname, Israel, where it is quite a rare surname, and Uruguay, where it is a rare surname. Not in comparison with a country's population, it is commonest in the United States, Israel, and Russia. Very seldom, Belfer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Belfer | Canada, France, Israel, United States, Argentina |
| Behelfer | United States, Canada |
| בלפר | Israel |
| Бельфер | Kazakhstan, Russia, Ukraine |
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jicchak belfer Israeli artist and Holocaust survivor, PL (b. 1923) |
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| arthur belfer american businessman and philanthropist, US (b. 1906) |
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| steve belfer American composer, US (b. 1971) |
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| isabella belfer israeli kidnapper |
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| robert a. belfer American oilman and philanthropist |
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| julie j belfer researcher |
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| lauren belfer American writer |
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| samuel belfer researcher |
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| ella belfer researcher ORCID ID = 0000-0001-9784-8531 |
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| inna belfer researcher |
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| james belfer film producer, US (b. 1987) |
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| mitchell belfer (b. 1977) |
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| mitchell a. belfer (b. 1978) |
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