Just had a relevation from my e-book about Hinduism. Theory: the word Avatar used by James Cameron et. al. comes from the term avataras which are the incarnations of Visnu, Rama and Krsna, as seen in 2nd century BCE epic poems.
Hollywood has really outdone itself. It was like discovering that the philosophers stone was really something, that Tolkien borrowed the idea of the rings from Beowulf, and that Twilight is basically Wuthering Heights with a few minor changes.