Where does “Teerão” come from?

Teerão (Portuguese) comes from Persian تهران, from Persian ری, from Middle Persian ldy, from Old Persian 𐎼𐎥𐎠.

Ancestry of “Teerão”, step by step

StepLanguageWordMeaning
1PersianتهرانThe Tehran Conference (1943)
2Persianریon; above; upon
3Middle Persianldy—
4Old Persian𐎼𐎥𐎠—
Every word from Old Persian 𐎼𐎥𐎠 →Every word from Middle Persian ldy →Every word from Persian ری →