Charon, the celestial body, used to be thought of as a moon of the planet Pluto. But if you've been paying attention in class, you know that Charon and Pluto are now both considered dwarf planets, which orbit each other. (Source.)

In the God of War video game, Charon throws Kratos into the black pit of Tartarus, but later Kratos escapes and kills the Ferryman. Sorry, Char-man.

Charon is the name of a Pokemon character. Can't ask for much more than that.

In the movie version of The Lightning Thief, Charon is simply called the Ferryman. Apt name, we'd say.