Where does “Ruginești” come from?

Ruginești (English) comes from Romanian Ruginești, from Romanian rugină, from Latin aerūgina, from Latin aerūgō, from Latin aes, from Proto-Italic aos, from Proto-Italic ajos, from Proto-Indo-European h₂éyos — a metal, copper, bronze.

Ancestry of “Ruginești”, step by step

StepLanguageWordMeaning
1RomanianRuginești—
2Romanianruginărust
3Latinaerūgina—
4Latinaerūgōrust of copper, verdigris
5Latinaesmoney, pay, fee, fare; copper, bronze, brass;...
6Proto-Italicaosbronze, copper
7Proto-Italicajos—
8Proto-Indo-Europeanh₂éyosa metal, copper, bronze
Every word from Proto-Indo-European h₂éyos →Every word from Proto-Italic ajos →Every word from Proto-Italic aos →