The fuck happened with that one. Its literally the same word, this isnt an aluminum vs aliminium situation where the namer was a fuck up and called it both so people flipped a coin. Fucking English spelling is ratfucked.
No one has ever proposed “aliminium” for the name of the element.
“Alumium” was the original, “Aluminum” and “Aluminium” were battled in American and British journals.
The -ium ending is the standard naming convention for elements, e.g., plutonium, natrium, kalium.