Pac-Man started life as Pakkuman in Japan, created from the Japanese phrase “paku-paku taberu”, slang for smacking your lips.
(According to the creator Toru Iwatani, it was to be called Puck-Man for its US release, but the name was changed because they realised someone might vandalize the “P” and turn it into an “F”, so they changed it to Pac-Man.
And the rest, as they say, is history.)