Thread:Bagwis/@comment-12719-20171101073356/@comment-12719-20171101074631

Another source of "official" spelling would be whoever is licensed to distribute and translate the work into the English-speaking regions. In this case Crunchyroll uses "Oga" and "Ryo" for both the licensed manga and anime. The downside of using licensed translation spellings is if a few years later a different company gets the license, retranslates things and pick a different spelling, then that becomes the new official spelling.