Text (SM+errata): As ~this~ enters the battlefield, name a card. ; You have protection from the chosen name. [Oracle 2009/07/08]
You cannot name a token, but if you choose the name of a card that happens to match the name of a token, you do gain protection from the token. [Shadowmoor FAQ 2008/04/21]
Note - Also see Rule 708.7 for rules on naming Split Cards and Rule 709 for rules on naming Flip Cards.
