The origin of many AF, Myth, and Esoteric equipment comes from FFXI's Artifact/Relic/Empyrean equipment.

http://ffxiclopedia.wikia.com/wiki/C...Artifact_Armor
http://ffxiclopedia.wikia.com/wiki/Category:Relic_Armor
http://ffxiclopedia.wikia.com/wiki/C...Empyrean_Armor


That said, the new DRK AF, since it's a new job in XIV, will likely have its next AF set have the adjective "Abyss" in its name, e.g. Abyss Flanchard.