Midgarsormr

[Hainiryun]

Or the Midgar Zolom?

Yes, actually but not in the way you'd think. The Midgar Zolom enemy in VII is named Midgardsormr in the japanese version. It was eroneously translated to Midgar Zolom. (Incidentally VII also features the first appearance of Nidhogg in the franchise. As a little yellow snake whose english name is "Heg").

Names aside there's no actual connection though. FF as a franchise just likes to make use of mythological names and concepts but as a general rule each title is standalone (XIV makes a lot of callbacks and alusions to other games in the franchise but they're still distinct and adapted to fit this game).