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Jonathan Groff | American actor and singer |
| JJ | Jonathan Johnson | |
| JJ | Jonathan Johnson | |
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Jonathan Meese | German painter, sculptor, performance artist and installation artist |
| JO | Jonathan Oppenheim | British physicist |
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Jonathan Pryce | Welsh actor (born 1947) |
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Jonathan Roumie | American actor |
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Jonathan Swan | Australian journalist |
| JR | Jonathon Ross | New Zealand water polo player |
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Jon Cryer | American actor |
| JU | Jong Un-sim | North Korean athletics competitor |
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Jon Hopkins | English electronic musician and producer (born 1979) |
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Jon Lajoie | Canadian comedian and musician (born 1980) |
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Jon Meacham | American journalist and biographer (born 1969) |
| JJ | J'onn J'onzz | fictional character from Supergirl |
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Jon Richardson | English comedian and author |
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Jon Schaffer | American guitarist |
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Jon Snow | British broadcaster |
| JTB | Jon Trondson Benkestok | 1530- |
| JW | Jon Wickizer | basketball player |
| JW | Jon Wicks | British kyokushin |
| JC | Jordan Catalano | fictional character from My So-Called Life |
| JD | Jordan Dreyer | lead vocalist of La Dispute |
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Jordan Fisher | American singer and actor |
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Jordan Mechner | American video game designer |
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Jorge Jesus | Portuguese football manager and former player |
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Jörg Kachelmann | Swiss television presenter and journalist |
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Jörg Meuthen | German economist and politician |
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Jorja Smith | British singer, songwriter and musician |
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Josef Breuer | Austrian physician (1842-1925) |
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Josef Gangl | German officer AS (b. 1910, d. 1945) |
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José Mujica | Uruguayan guerrilla fighter and politician |
| JC | Josep Cornella | researcher ORCID ID = 0000-0003-4152-7098 |
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Joseph Banks Rhine | American parapsychologist (1895-1980) |
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Joseph Brodsky | Russian-American poet (1940-1996) |
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Joseph Bruce | American rapper |
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Joseph Conrad | Polish-British writer (1857–1924) |
| JC | Joseph Cooper | fictional character from Interstellar |
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Joseph de Maistre | Savoyard philosopher, writer, lawyer, and diplomat (1753-1821) |
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Joseph Fiennes | English film and stage actor (born 1970) |
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Joseph Garrett | English YouTube presenter (born 1990) |
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Joseph Haydn | Austrian composer (1732–1809) |
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Joseph Heller | American writer |
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Joseph Joubert | French moralist and essayist |
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Joseph Kobzon | Soviet and Russian singer (1937–2018) |
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Joseph McCarthy | American politician (1908–1957) |
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Joseph M. Juran | Romanian-American engineer and management consultant (1904–2008) |
| JPK | Joseph P Kennedy | American academic |
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Joseph P. Kennedy Sr. | American businessman, politician and diplomat (1888–1969) |
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Joseph Quinn | British actor |