- LL Cool J – James Todd Smith
- David J – David Haskins
- Jessie J – Jessica Ellen Cornish
- Tony Jaa – Panom Yeerum
- Chubby Jackson – Greig Stewart Jackson
- Ezekiel Jackson – Rycklon Stephens
- Jackie Jackson – Sigmund Esco Jackson
- Rebbie Jackson – Maureen Reilette Jackson
- Tito Jackson – Toriano Adaryl Jackson
- Billy Jacoby (a.k.a. Billy Jayne) – William Jayne
- Hattie Jacques – Josephine Edwina Jacques
- Claude Jade – Claude Marcelle Jorré
- Jaël – Rahel Krebs
- Bobby Jaggers (a.k.a. Bobby Mayne) – Robert F. Jeaudoin
- Jaimeson - Jamie Williams
- Boney James – James Oppenheim
- Brian James – Brian Robertson
- Dennis James – Demie James Sposa
- Elmore James (akas: Cleanhead; Joe Willie James) – Elmore Brooks
- Etta James – Jamesetta Hawkins
- Gordon James – Sydney Lynn
- Joni James – Giovanna Carmella Babbo
- Kevin James – Kevin George Knipfing
- Markus James – Markus James Klepaski
- Rick James – James Ambrose Johnson
- Sid James – Joel Solomon Cohen
- Skip James – Nehemiah James
- Sonny James – James Loden
- Jenna Jameson – Jennifer Marie Massoli
- Dorothy Janis – Dorothy Penelope Jones
- Elsie Janis – Elsie Bierbower (some sources indicate Elsie Beerbower)
- Emil Jannings – Theodor Friedrich Emil Janenz
- Steve Jansen – Stephen Batt
- David Janssen – David Harold Meyer
- Anna Jantar – Anna Maria Szmeterling
- Paul Jarrico – Israel Shapiro
- Sir David Jason – David John White
- Rick Jason – Richard Jacobson
- Sybil Jason – Sybil Jacobson
- Jam Master Jay – Jason Mizell
- Jennifer Jayne – Jennifer Jones
- Michael Jayston – Michael James
- Jay-Z – Shawn Corey Carter
- Jazze Pha – Phalon Anton Alexander
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- Gloria Jean – Gloria Jean Schoonover
- Zizi Jeanmaire – Renée Marcelle Jeanmaire
- Jazzy Jeff – Jeffrey Townes
- Jefferson – Geoff Turton
- Blind Lemon Jefferson – Clarence Jefferson
- Anne Jeffreys – Anne Carmichael
- Richard Jeni – Richard John Colangelo
- Jack Jenney – Truman Eliot Jenney
- Ron Jeremy – Ronald Jeremy Hyatt
- Chris Jericho – Christopher Keith Irvine
- Jessicka – Jessica Fodera
- Jethro – Jeff Rowe
- Joan Jett – Joan Marie Larkin
- Dina Jewel (akas: Nanna Gibson, Nanà Elliot) – Nanna Grønnevik
- Jibbs – Jovan Campbell
- Ann Jillian – Ann Jura Nauseda
- Jim Bob – James Robert Morrison
- Jimmy The Robot – James Briggs
- John 5 – John Lowery
- Sir Elton John – Reginald Kenneth Dwight (name legally changed to Elton Hercules John on September 2, 1972
- Rosamund John – Nora Rosamund Jones
- Holly Johnson – William Johnson
- Kay Johnson – Catherine Townsend Johnson
- Money Johnson – Harold Johnson
- Rita Johnson – Rita McSean
- Tor Johnson – Tor Johansson
- Van Johnson – Charles Van Dell Johnson
- JoJo – Joanna Noëlle Levesque
- Jolens – Maria Jolina Perez Magdangal
- Angelina Jolie – Angelina Jolie Voight
- Pete Jolly – Peter Ceragioli, Jr.
- Al Jolson – Asa Yoelson
- Jon B. – Jonathan David Buck
- Lil Jon – Jonathan Smith
- Buck Jones – Charles Frederick Gebhart
- Chloe Jones – Melinda Dee Taylor
- Grace Jones – Grace Mendoza
- Griffith Jones – Harold Jones
- Jack Jones (singer) – John Allan Jones
- Jennifer Jones – Phylis Lee Isley
- Jenny Jones – Janina Stranski
- Jo Jones (American drummer) – Jonathan David Samuel Jones
- John Paul Jones (musician) – John Baldwin
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- Norah Jones – Geethali Norah Jones Shankar
- Samantha Jones – Jean Owen
- Spike Jones – Lindley Armstrong Jones
- Tom Jones – Thomas John Woodward
- Spike Jonze – Adam Spiegel
- Jordan – Katrina Amy Alexandria Alexis Infield
- Clifford Jordan – George William Jorgensen, Jr.
- Lonnie Jordan – Leroy Jordan
- Richard Jordan – Robert Anson Jordan, Jr.
- José José – José Rómulo Sosa Ortiz
- Paulo José – Paulo José Gómez de Sousa
- Darwin Joston (sometimes credited as Darwin Jostin) – Francis Darwin Solomon
- Louis Jourdan – Louis Gendre
- Journalist – Rafiek George
- Milla Jovovich – Milica Nataša Jovović
- Jowell & Randy – Joel A. Muñoz Martínez & Randy Acevedo Ortíz
- Leatrice Joy – Leatrice Joy Zeidler
- Brenda Joyce – Betty Graftina Leabo
- Elaine Joyce – Elaine Joyce Pinchot
- Ella Joyce – Cherron Hoye
- Yootha Joyce – Yootha Joyce Needham
- Ashley Judd – Ashley Tyler Ciminella
- Naomi Judd – Diana Ellen Judd
- Wynonna Judd – Christina Claire Ciminella
- Miranda July – Miranda Grossinger
- Jun Ji-hyun – Wang Ji-hyun
- Julissa – Julissa de Llano Macedo
- Shia Jung – Toshia Ichioka
- Junkyard Dog – Sylvester Ritter
- Katy Jurado – María Cristina Estela Marcela Jurado García
- Just-Ice – Joseph Williams, Jr.
- Juvenile – Terius Gray
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