[Zuider]

Aristotle's actual writings are lost. The books attributed to Aristotle are comprised of lecture notes collected by his students, later compiled according to topic, so you get the Ethics, the Politics, the Physics and Metaphysics.

They didn't quite know how to name the last book since its contents were so abstract and unrelated to the everyday world, so they simply called it "the book that comes after the Physics," which eventually became known as the Metaphysics. It is worth noting that the title is a specific reference to the book, not to any notion of the subject matter somehow transcending physics. After all, why physics, in particular?

In the light of that, it is even more jarring to see the term 'metaphysics' being used to describe spiritualism and new age mysticism.