What is the real name of Sonic the Hedgehog?

In the Archie comics, Sonic's real name is revealed to be Olgilvie Maurice Hedgehog. He tries desperately to protect that information, possibly out of embarrassment. This name is not canon (official) in the game continuity, however, and he is simply known as Sonic the Hedgehog in the games. It is unknown why his name was changed in the comics.

"Maurice" is the name of his grandfather which was passed down to Sonic (from Archie comics, which some fans claim is not canon), and "Ogilvie" seems to be the name of his other grandfather (based on some fan rumors, however, this seems widely accepted for some reason).