Family name Portnoy (Portnoy 
, Портной 
, פורטנוי ) , all over the world, is quite a common cognomen. The last name Portnoy is characteristic of Israel, where it is quite a common surname, Russia, where it is quite a rare surname, and Ukraine. In absolute terms, the name is most common in Russia, the United States, and Israel.
| gerson portnoy holocaust victim, b. 1876-04-12, AT (b. 1876) |
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ethel portnoy Dutch writer, US (b. 1927) |
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| jente portnoy holocaust victim, b. 1880-08-20, AT (b. 1880) |
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jerry portnoy American blues musician, US (b. 1943) |
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ana portnoy Argentine photographer, AR (b. 1950) |
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| braine portnoy holocaust victim, b. 1905-10-02, AT (b. 1905) |
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mike portnoy American drummer, US (b. 1967) |
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michael portnoy American contemporary artist, US (b. 1971) |
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david portnoy American internet entrepreneur and celebrity, US (b. 1977) |
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| howard portnoy former radio-dj and father of Mike Portnoy, US (b. 1940) |
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| harold portnoy (b. 1932) |
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| howard n. portnoy US author and teacher (1946- ), US (b. 1946) |
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| gary portnoy American musician, US (b. 1956) |
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| daniel a. portnoy American Microbiologist, US (b. 1956) |
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| suzanne portnoy American writer (b. 1961) |
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