I have a book on the genealogy of the inhabitants of the Bischmisheim area of Germany before 1900. In the book is genealogy info on several MAUL families. If you would like a lookup to see if your MAUL is in the book, just let me know.
The earliest MAUL in the book appears to be a Christian MAUL b.02 Nov 1786 in Guedingen. He was son of Bernhard MAUL and Dorothea ___. Christian Maul married on 18 Jan 1810 in Saaerbrucken, to Margareta DEUTSCH. They had 6 children: Dorothea, Johann Christian, Jacob Daniel, Catherina Elisabeth, Wilhelm, and Johann Nickel.