How to correct or update the first name on a Battle.net account
Information about this error when creating a World of Warcraft character
What to do if you want to swap the names between two of your characters
How to report a guild name in World of Warcraft.
Guild name is taken but the guild using the name is not active or is empty.
Information on the Name Change character service
How to change a Character Name in SC2
Information about this issue
Rules for player-made names in World of Warcraft and how to report a bad name