[Facts] Yup, "fairy queen" is a confusion with Titania . . .
. . . which doesn't mean "fairy queen" anyway, it's just the name of Shakespeare's fairy queen!
The bald facts are that no-one knows what Tatius means or exactly where it came from, so we can't figure out what the derivative names mean either.
♦ Chrisell ♦
All we have to decide is what to do with the time that is given us. - J.R.R. Tolkien.