Hmm... Same thing happened to almost all my chars (that was moved from the Elysium realm).
"Thunderlight" I changed to "Thundertouch" "Guldbank" I changed to "Guldbankk" "Quizmaster" I changed to "Quizzmaster" Notice: I have the name "Guldbank" on a horde char, but still got "naming violating" on the ally char with the same name and had to change it ... maybe the "naming violating" message is bugged and should be "that name is already taken"! .... But then again "Thunderlight" was a "violating" name it said.... I really don't see anything wrong with the name ... ( And it doesn't look like anyone used that name on the old Nost according to http://realmplayers.com/CharacterList.aspx?search=Thunderlight&realm=NRB ) so ye the Character renaming thingy is acting a bit weird!
Lets hope someone from staff can clarify things... And if possible... give us the correct old names back ! I am 100% with you on the part that: "I would really like my old name back if it is available.".