Sorry did not notice the question until now. The term comes from a compound of two latin words that mean Beyond Natural. We know that Humans after the fall did not “walk with God” as the Bible tells us Adam and Eve did in the Garden, nor do we have the other gifts described in the Bible before the fall.
We live in a world where English is the primary language used around the world. However Theologians and Science both use Greek and Latin to describe, and define concepts. So a word like Preternatural, which seems odd to us, is simply derived from a language we don’t use daily.