I don`t know if you live in Germany, but we DO say Halle (Saale) (without pronouncing the parenthesis.
And there are more examples in Germany like Frankfurt (Oder) etc.
AS you refer to the guidelines for the name key:
"For disputed areas, please use the name as displayed on, e.g., street signs for the name tag" https://www.mapillary.com/app/?lat=51.513526252261&lng=11.873226642617&z=17&pKey=507355080681606&focus=photo