Io is a moon of Jupiter, where things are seriously nuts. Not only does it have gigantic mountains way taller than any on Earth, it's also one of the most volcanically explosive places in the solar system. (Hmm, maybe she's so explosive because she's ticked off about orbiting a planet named after the god who caused her so many problems...)
In the world of DC Comics, Argus is the name of a superhero who can see beyond the visible light spectrum and can re-grow his eyes when they're gouged out. (We bet the real Argus wishes he'd had the power to re-grow his head.)
Argus Filch, the grumpy caretaker of Hogwarts, may or may not be able to see through the eye of his cat, Mrs. Norris. Could Filch be "all seeing" like the giant he's named after—despite the fact that he's a squib?
In the glitzy 2010 Clash of the Titans remake, a character named Io pops up to guide Perseus and tell him all about his birth. This Io doesn't have a whole lot to do with Io from Greek mythology, but she's still cool with us.
In DC's Wonder Woman comics, Io is the name of butt-kicking Amazon blacksmith. Again, she doesn't have whole lot in common with original Io—why do people like the name so much but not what's underneath?