Glad to see this project is still rolling!
Child of the Mountain
Below are all my opinions, feel free to critizize. But please keep it civilized.
A pretty "normal" ship name, fits quite well with a UNSC ship (Anything smaller than a UNSC Destroyer).
I have a feeling this name would fit best with a UNSC Prowler, Corvette or Light Frigate (Note I said Light, not Heavy, like UNSC Grafton.)
I agree with headdie, it's in the same vain as Pillars of Autumn. But that's also exactly why I disagree with having this name for a Frigate. Because UNSC Pillar of Autumn and her sister ships are all Halcyon class Cruisers, not Frigates. However, it's still a great name that you came up with.
Child of the Mountain:
Weird name, change it to Mountain Child instead then I can imagine it being a UNSC Heavy Frigate or Destroyer.
Yeah, Covenant ship.