I hadn’t realized that aluminum was the name given by Humphrey Davy himself in 1812. It didn’t take long for someone to step in and change it.
1812 SIR H. DAVY Chem. Philos. I. 355 As yet Aluminum has not been obtained in a perfectly free state.
1812 Q. Rev. VIII. 72 Aluminium, for so we shall take the liberty of writing the word, in preference to aluminum, which has a less classical sound.
OED says of the change in form
The termination -ium now preferred harmonizes best with other names of elements, as sodium, potassium, magnesium, lithium, selenium, etc.
Preferred by whom? Is the implication that the scientific world in general prefers the -ium ending? Do American scientists say aluminium?