According to the biography of former Apple CEO John Sculley,
Odyssey: Pepsi to Apple, Jobs launched the Mac in 1984 even though
the “Mac” trademark belonged to another company.
“Knowing we would face trademark challenges over Steve’s decision to
launch Macintosh under its original codename, Al (Eisenstat, Apple’s
general counsel) had argued at full volume that Steve should pick
another name for the computer,” Sculley writes on page 208.