Not Based on it, no. But some themes are a part of our culture. And some themes just work, like the orphan who knows nothing about his family...
Finding interesting parallels after reading the story is not the same as using them to predict JKR's future story. I don't think it will be helpful in that way.

I'm just trying (like everyone else) to figure out what the Deathly Hallows are.
"The Hallows of Hogwarts" suggests that they are in Hogwarts, whatever they are.
Maybe Hogwarts has an ancient, forgotten mosoleum down below the dungeons or something...