When did the ship's name change from The Tantevive IV to the Tantive IV?
Never. It has always been the Tantive IV.
http://starwars.wikia.com/wiki/Tantive_IV
Of course, it was apparently called the Star of Alderaan originally, but was quickly renamed.
Then the he's just mispronouncing the name and my memory of the spelling is bad. Just double checked(Don't always agree with wiki) It's also morning and not the middle of the night.
Tan-ti-vee was how it was pronounced in the Radio Dramas, which are considered as canon as the films (moreso if you ask me, because there is only one version of them).






