quoted from the FAQ

Regarding transfer requests from one account to another account, note that you may only request character transfers from one account where you are the subscriber to another account where you are the subscriber. Any attempt to transfer a character from an account where you are not the subscriber could be considered a violation of the World of Warcraft Terms of Use and could lead to Blizzard taking disciplinary action against your account, including, but not limited to warnings, temporary account suspension, or permanent account suspension, as determined by Blizzard.
The ownership details must match otherwise it is a violation of the EULA/TOS, yes the last name on the registered account owners need to match for this to take place, if your willing to take the risk of not being found out by Account admin then go for it