My friend forgot his account name

So I have a friend that wants to comeback to the game after 1 year, but he forgot his account name and the email that he used. So I want to know if u guys can send me only the account name or the email (not the password because I don't want to make it look like I want to steal his account). He have a human warrior named Martinna, a char (I can't remember what it was) named Harmonyh and other named Xharmony. He donated it too, I don't know if that helps. He used to play in Icecrown, Wotlk.

They don't give out usernames based on "He has a char named this" because of obvious reasons.
He should email [email protected] they'll probably ask for a donation receipt or something like that because other than that nothing really proves he is the actual owner.
Also, I've forogtten an email on one of my accounts and they gave me like a "it starts with ab*********" hint so that helped enough.