Well, grb said that they named a Sovereign class starship after the Voyager. Starfleet is reasonably certain that the Intrepid class Voyager is still alive and well. It wouldn't make sense to give the Voyager name to another ship.
------------------ "We choose to do this and more. Not because it is easy, but because it is hard." -- John F. Kennedy
The soverign class USS Voyager could have been declared after Voyager was lost, but before they contacted home.....
------------------ "How many people does it take before it becomes wrong? 6,000? 60,000? How many people does it take admiral!?!" -Ambassador Picard during his command of the Enterprise-E in the Ba'ku incident.
Bernd, I think you said 'should' when you meant to say 'could'...
...except of course there couldn't because the USS Constitution and the USS Galaxy have been referred to. The USS Sovereign or USS Royal Sovereign hasn't.
And name the episode or film where it was stated that the first ship of a class and the class itself always have the same name, let alone exactly the same name.
The reference in the encyclopedia to "the starship we call The City of New Orleans" is a joke, but there's actually no reason why the class ship of the New Orleans class couldn't be the USS Cty of New Orleans.
Well, it's how the Royal Navy, and those that copied the RN such as the USN, normally do things.
There are examples where the class is named after a different ship to the first one build. There are also examples of where the class has a totally different name (eg the RN Tribal class, HMS Zulu, etc. never had a ship called HMS Tribal).
There's no reason why Starfleet wouldn't sometimes shorten long names.
Or if you want some justification for this example: why would the republican, classless Federation call a ship Sovereign? Royal Sovereign at least has the advantage of being named after a famous RN Battleship.
Why wouldn't they name it USS Sovereign? As far as I know no Starfleet vessel is named ter a 20th century sailing vessel. Sure, they may have the same name, but they are both named after something else, a person or a place. As for a definition of Sovereign (in verb form):
1 Above all others; chief; supreme 2 supreme in power, rank, etc. 3 independent of all others
his means the 'Sovereign' was named so because she is above all other classes in nearly all categories, supreme in power
THE359: The USS Enterprise (NCC-1701) is named after an American carrier of the mid-twentieth century, a space shuttle, and a spaceship designed and built between 1976 and 2245. Source: The Motion Picture.
Actually, the point from The Motion Picture is that those were all ships that were named Enterprise, it never said the Enterprise itself was named after them. It was more likely named after the definition for Enterprise:
1 An undertaking, esp. a big, bold, or difficult one 2 energy and initiative