Where does “aramen” come from?

aramen (Latin) comes from Late Latin aeramen, from Latin aes, from Proto-Italic aos, from Proto-Italic ajos, from Proto-Indo-European h₂éyos — a metal, copper, bronze.

Ancestry of “aramen”, step by step

Step	Language	Word	Meaning
1	Late Latin	aeramen	copper, bronze
2	Latin	aes	money, pay, fee, fare; copper, bronze, brass;...
3	Proto-Italic	aos	bronze, copper
4	Proto-Italic	ajos	—
5	Proto-Indo-European	h₂éyos	a metal, copper, bronze

Every word from Proto-Indo-European h₂éyos →Every word from Proto-Italic ajos →Every word from Proto-Italic aos →