Touche good sir
However I am not going to give Hasbro that much credit for knowledge of linguistics, They might have googled it, gone ooh, that has a nice origin, let's use Armada coz kids might know it (of course until it's confirmed, it's all just speculation) so um, yeah.
nothing like a strong finish to one's argument.
Still it would be nice to have some sort of reasoning as to why they went for Armada. As Griff pointed out. Energon was obvious, Cybertron made sense (despite the fact they spent the least amount of time on it, it was there goal...)
Maybe Armada is a reference to Tidalwave, although at the most he was a fleet.