According to the Original Soundtrack (OST), it's "Wind Scene". That's the name I prefer as well. "Yearnings of the Wind" gets less Google hits and is also the name of a remix for the song. Also, the official title would never be the name of the area from the game ("AD 600") unless no other name was given.
I was a little confused by official names for Secret of Mana songs too. Okami's another example since the title's originally come in Japanese (but then, I guess all the aforementioned RPGs would have music titles originally in Japanese), so what we might think of as an official title may just be whatever the English localization team came up with. To this day I'm not sure if the official title for that one song from Okami is "The Sun Rises" or "Rising Sun". The OST suggests "The Sun Rises" (it sounds more official with a "the" in there), but I often see the title "Rising Sun" too. Also, the names given to the songs in the game don't match up with the names given for the OST.
