Weapon(s) Lore in XIV (SPOILER)

[Balipu]

Since Ultima Weapon is the only franchise staple, I'd say the chances are somewhat low. It's certainly a possibility, but Ultima Weapon and Omega (sometimes Omega Weapon) are the only ones that recur throughout the franchise - Emerald, Ruby, Diamond, and Sapphire Weapon were all unique to VII as planetary self-defense mechanisms.

As always I won't say it's impossible, but the likelihood if that happening seems somewhat low at the moment.

I made the same mistake but Omega Weapon and Omega are actually two different creatures.

http://finalfantasy.wikia.com/wiki/Omega_Weapon_(enemy)

http://finalfantasy.wikia.com/wiki/Omega_(enemy)

Those your head hurt yet? No? Okay.

There is an Ultima Weapon creature, an Ultima spell and an Ultima Weapon sword. And these there are not necessarily related. In VII while UW drops the UW it casts Ultima Beam, but not regular Ultima.