Or even Vulcan terminology for starships, considering that we explicitly heard Vulcans providing our Earthling heroes with the "warbird" concept in the pilot episode, and that Vulcans would be the likeliest source for terminology relating to the Romulan war machine just prior to the big war...
We know Romulans are big on bird themes. But they supposedly were that even before the big rift, as they were known as "those who marched under the raptor's wings"... It may well be an old Vulcan thing to regard spacecraft as avians.
Makes sense. Starfleet got its "Class M" planetary designation from the Vulcan "Minshara" class. Not much of a stretch to extend it into ship classes.