Still confused? Here's a little more about the history of aluminum's naming and discovery. Guyton de Morveau (1761) called alum, a base which had been known to the ancient Greeks and Romans, by the name alumine. In 1808, Humphry Davy identified the existence of the metal in alum, which he at first named alumium and later aluminum. Davy knew aluminum existed, but he didn't isolate the element. Friedrich Wöhler isolated aluminum in 1827 by mixing anhydrous aluminium chloride with potassium. Actually, though, the metal was produced two years earlier, though in impure form, by the Danish physicist and chemist Hans Christian Ørsted. Depending on your source, the discovery of aluminum is credited to either Ørsted or Wöhler.
Pictures of Famous Chemists | Aluminum (or Aluminium) Facts
Image: Sir Humphry Davy. Engraving taken from "The Life of Sir Humphry Davy" by John A. Paris, London: Colburn and Bentley, 1831.