User blog comment:Sara.mujallid/Oda has gone mad/@comment-3986064-20111006205528

Well lets see, maybe, but just maybe, there were people on skypiea who used mantra, not only Enel, remember, Aisa had it too, from birth, so maybe the name of mantra is either only on skypiea, or in both skypiea and birka, common name or name taken from skypiean people, so if you add one more factor, it all makes sense(although this doesn't really, since I'm really tired)