J
- Jack Daniel Distillery – Jack Daniel
- Jackson Guitars – Grover Jackson
- Jacuzzi – The Jacuzzi brothers
- James Purdey and Sons – James Purdey
- J. Barbour & Sons – John Barbour
- JBL – James Bullough Lansing
- J. C. Bamford – Joseph Cyril Bamford
- JCPenney – James Cash Penney
- Jean Coutu Group – Jean Coutu
- Jil Sander – Heidemarie "Jil" Sander
- The Jim Henson Company – Jim Henson
- Jimmy John's – Jimmy John Liautaud
- J.J. Newberry – John Josiah Newberry
- Jo-Han – JOhn HANley
- Joe Gibbs Racing – Joe Gibbs
- Joest Racing – Reinhold Joest
- John Cooper Works – John Cooper
- John Deere – John Deere
- Johnson & Johnson – Robert Wood Johnson I, James Wood Johnson, and Edward Mead Johnson
- Johnson Publishing – John H. Johnson
- Jones Lang Wootton – the last names of its three principal members
- Jordan Grand Prix – Eddie Jordan
- J.P. Morgan & Co. – J. P. Morgan
- JR Motorsports – Dale Earnhardt, Jr. (Earnhardt is frequently referred to in NASCAR circles as "Junior")
- JTG Daugherty Racing – Jodi and Tad Geschickter, and Brad Daugherty
- Judd – John Judd
- Junkers – Hugo Junkers
Read more about this topic: List Of Companies Named After People