In the account manager on Warcraft it blocks the full name on the account.
I found out how to obtain this by accident.
I traded accounts a while back and lost the email with the full account name.
I pay my accounts with a prepaid visa card and one month the account had insufficient funds. I received this email
http://img204.imageshack.us/img204/4999/failrt5.jpg
It actually showed the entire first and last name of the account!
Of course you would need to pay for a month first.