It's not really up to Turkey [or Türkiye] how the English language spells their country's name, is it? Any more than it's England's* business how Turkish speakers spell İngiltere
*[other English speaking countries are available]
*[other English speaking countries are available]
Indeed, by choosing one or the other, you could be implicitly taking a position on that country's internal affairs .. even if you aren't aware of the issue.
Recently there's been a lot of support to use "Kyiv" instead of "Kiev".
Almost everyone now uses "Beijing" instead of "Peking", excepting a few cases.
"Bombay" or "Mumbai"? "Calcutta" or "Kolkata"? (See https://en.wikipedia.org/wiki/List_of_renamed_places_in_Indi... .)
Do you refer to the city in New Mexico as "Hot Springs" or "Truth or Consequences"? (Or as "T or C")?
There's quite a few examples I could come up with, which means it's not that uncommon. And you see uptake depends on many factors.
It seems that it absolutely is something that a nation can request and other nations should comply with - unless... Is there some controversy? I mean, the timing of this request makes one think that perhaps it is a negotiating tactic with allowing NATO expansion.
For some further context: “Persian” is the preferred term in English for the language spoken by most of the people of Iran. “Farsi” is the name of that language in that language.
There is a language institute that manages formal rules (like French) and they prefer to keep the long association in western sources with the name “Persia” over a more native name — “farsi” is the Arabized form of the older “parsi”. This change is due to Arabic not having a p sound.