I saw this while in the bookstore last night:
The paperback adaptation of the movie is titled identically to Anglo-Saxon poem.
Now I don't think it's a bad thing to reinterpret old stories and legends; Neil Gaiman's career is pretty much built on it. You'll note though that none of the well regarded deconstructions use the same title as the original.
Would it have really killed them to title it Beowulf: The Movie? I do think it will be entertaining when someone needs Beowulf for a class and winds up with this thing.