Awesome suggestions... and I personally liked "Legacy" and XIV... or did Mudd really mean "X|V" Engine? (Cuz that's the new logo theme). A couple suggestions I'd like to add are:

Rapture (yes, again... or just Rapture Engine 2.0)
Dalamud (not "Dalamud engine"...just "Dalamud". Has a sinister ring to it)
Kusanagi Engine (Since all the servers are named after legendary weapons?)
Ultima Engine
Kupo Engine
Hydaelyn
Ouranos Engine (taken from the Chocobo tale "The Tragic Ride of Ouranos")
The Twelve Engine