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.
It's possible to have a name mismatch in different UI elements after a name change is completed
Information on the Name Change character service
How to change a Character Name in SC2
Information about this issue