User blog comment:Maki Kuronami/The answer for the Atlas/Atlys argument/@comment-24891101-20140808052801

So it is Elysian, per our discussion earlier. That makes for an interesting political structure in Atlas.

Nota Bene, Omnes: Atlasian doesn't fit the pronunciation, Atlysian/Atlesian has no relation to the adjectival form of Atlas, which is Atlantian, and are suspect on account of changing the vowel anyway. This leaves Elysian, which has the advantage of squaring with Ruby's pronunciation in "Welcome to Beacon".