Where does “Истанбул” come from?

Истанбул (Bulgarian) comes from Ottoman Turkish استانبول, from Greek εἰς τὴν Πόλιν.

Ancestry of “Истанбул”, step by step

StepLanguageWordMeaning
1Ottoman Turkishاستانبول—
2Greekεἰς τὴν Πόλιν—
Every word from Greek εἰς τὴν Πόλιν →Every word from Ottoman Turkish استانبول →