Harbinger
Troubadour
I know GRRM uses it for his names but I wasn't sure what the 'proper' format calls for.
In my opinion this is a purely stylistic choice. Whatever works best for you.
I know GRRM uses it for his names but I wasn't sure what the 'proper' format calls for.
I think this is a rule that exists only because there's widespread agreement. I can't think of any logical reason why ship names should be italicized but weapon names shouldn't;
Ships (and named vehicles more generally) are typically named after some understood reference (people, places, things). There's a difference between taking control of the Golden Hind and of the Golden Hind, or going to the Shenandoah and to the Shenandoah.
I don't know if that's the reason, but it is a reason. Of course, it could have arisen out of a desire to visually distinguish the proper noun from the surrounding text (Google's not telling me when this norm developed), just like you put a book's name in all caps in a plain text query letter.