"711.7. When a double-faced permanent transforms, it doesn’t become a new object. Any effects that
applied to that permanent will continue to apply to it after it transforms."
Das ist nicht ganz das richtige Zitat, weil ein Spell eben ein Spell ist und noch kein Effekt.
Letzten Endes wird hier beschrieben, unter welchen Umständen ein Spell fizzelt:
"608.2b If the spell or ability specifies targets, it checks whether the targets are still legal. A target
that’s no longer in the zone it was in when it was targeted is illegal. Other changes to the game
state may cause a target to no longer be legal; for example, its characteristics may have changed
or an effect may have changed the text of the spell. If the source of an ability has left the zone it
was in, its last known information is used during this process. The spell or ability is countered if
all its targets, for every instance of the word “target,” are now illegal. If the spell or ability is not
countered, it will resolve normally. Illegal targets, if any, won’t be affected by parts of a
resolving spell’s effect for which they’re illegal. Other parts of the effect for which those targets
are not illegal may still affect them. If the spell or ability creates any continuous effects that
affect game rules (see rule 613.10), those effects don’t apply to illegal targets. If part of the
effect requires information about an illegal target, it fails to determine any such information.
Any part of the effect that requires that information won’t happen."
Der Wechsel des Namens wird hier nicht als Umstand beschrieben, der zum Fizzeln des Spells führt. Ergo führt er einfach nicht dazu.