
The vast majority simply call it Istanbul, with the Balkan countries and Russia sometimes also referring to it as Tsarigrad and Romania, Moldova and Georgia still sometimes using the old name of Constantinople.
However, Greece is the lone holdout which refuses to recognise the last 500 years of history and stubbornly refuses to call it anything other than Constantinople (I guess they didn’t like it better that way).
Here’s more on the name change of the city:








