Now this is interesting. Dertien, if you choose to name ships after the Norse gods, may suggest that you use God names for "capital ships" (the large ones) and the names of their weapons and belongings for the smaller ships. Let me give you some examples.
Please note: All the spelling here is in modern Norwegian, if this is of interest I'll dig out the old Norse or Anglicised spellings. Also, this is just a quick introduction. There is a lot more if you choose to use this and run out of names for a certain category.
For the really large ships (Carriers etc.) names like:
Valhall (The huge house/hall were the dead vikings and their gods had their banquettes and did battle. All who died would be resurrected and could continue to party after the battle.)
Yggdrasil (The world tree who's roots extended into the worlds of the gods.)
For large ships: God names, and there are many more than mentioned here so far.
For smaller classes of ships:
Odins eight legged horse, Sleipner (Really fast and could travel on land, on water and in the air): Name for a really fast interdict type of ship. If you need another, Sleipners father is Svadilfare.
Thors hammer, Mjølner: For a not to big, but powerful gun ship class. (Black monk style)
Odins ravens, Hugin and Munin, who scouted and spied for him (Nothing that happened in the land of the gods could escape their keen eyes): For small fast scout ships. (They are featured on the emblem of the Norwegian Intelligence Service)
Odins wolfs Gere and Freke (The names both mean greedy):
And a lot more......
Just my 2 øre's worth.