How to Change the Internal Name of a Wii or GameCube Disc
Those who use WiiFlow or other such USB loaders to play their Wii and GameCube games may wish to change the name used for the game in the menu; to type in a name that looks more aesthetically appealing, or to distinguish between modified copies of the same game.
To change the name of a Wii or GameCube disc, open the game in a hex editor, locate the current name, then overwrite it by typing in your new name. This is the most reliable way to change the name of a disc.