If it were a sea-faring vessel, I'd name it "Marauder". Fitting for a lightning-strike raider, and it's a name that strikes fear into the heart of your enemy.
Now, a spaceship... well, there's really only one choice: a heavily armed and armoured battle-barge, bearing the name "Pride of Tizca". Why? Because fuck you, Space Wolves, you will pay for destroying Prospero!!!