My first exposure to Pac-Man was actually through Ms. Pac-Man, as well as the infamous Atari 2600 version of Pac-Man. Ms. Pac-Man is a better game, but Namco seems to be quietly ignoring it of late. They haven't put it in many of their recent collections, including the Switch collection.
Did you ever play Jr. Pac-Man or Baby Pac-Man? Those games and a couple of others made Namco management mad and that's when they took the license away from Midway. Jr. Pac-Man wasn't as good as Ms. Pac-Man, but it wasn't bad. I never saw Baby Pac-Man in the wild but I have an emulated version of it through a make-your-own-pinball-table program (it was a hybrid video game/pinball table.) Namco's "official" sequel to Pac-Man was Super Pac-Man.