Yup, Tethys was ONE of the names for one of the Titans in Greek mythology. BUT, Tetis is the spelling for it in many different cultures, as WELL as how the katakana dictate the name is pronounced ^_^ Someone on FESS ages ago, when I still went there, from one of those cultures, I forget which (mexican, maybe ...) was saying explaining that whole things, so I looked it up. And, ARG, I forget but one of the OTHER names that the spelling matching a different version matches the katakana was from the same thing, and now I forget it ;__;