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All in all it really depends in which direction the game is going actually
Each player will control an interstellar space exploration craft ("mothership") and will explore planets and other objects around distant stars. Initially the game will be single-player (perhaps with a multi-player component via a centralized server database of object discoveries and descriptions written by players that will be visible to all). So the idea is that there will be many space exploration craft, even if each player is only able to interact with one. So it cannot be named after a ship, because there will be many ships, and the player will probably be able to name their own ship anyway.
S O N S O F V O Y A G E R 1
Again, why this? It doesn't seem like something that really works, and doesn't seem like a very serious suggestion (sorry if I sound mean, I just want to avoid name spam).
O U T B O U N D
I actually like this one, though perhaps better to change it to "Outward Bound".