Is there a way to rename cities in Civilization 6?
Solution 1:
City Renaming has been added with the Fall 2016 update:
Open the city details pane (the highlighted page icon on the panel) and click on the city name in the top left corner of the screen
Solution 2:
http://steamcommunity.com/app/289070/discussions/0/340412122411024672/
Apparently it's an issue they'll fix in an upcoming patch.
Solution 3:
You can edit the city names txt in the assets folder.
http://www.gamepur.com/guide/24727-easiest-way-raname-city-name-civilization-vi.html