How quickly did citizens of a renamed city (like İstanbul or Leningrad) adapt to the new name?

by PaladinSquid

I'm writing an urban fantasy story and one of the worldbuilding elements is that a recently empowered god-king in the American Midwest has renamed cities to remove references to Christianity in an effort to project his kingdom's influence. I know the Soviet Union attempted a similar task with the renaming of Petrograd to Leningrad (and IIRC the renaming of Constantinople to İstanbul was for a similar reason) so I'm wondering what the historical immediate and long term responses were by the citizens of cities like that which underwent these kinds of changes.

AncientHistory

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