You can easily change the language for voice guidance, or deactivate it completely.
By default, the language used for Maps voice guidance matches the general language settings of your phone. You can change the language used for walk guidance before you start navigating.
If you select a language that includes street names, also the street names are said aloud. Voice guidance may not be available for your language.
Select
> Maps.
Select
> Settings > Maps & Walk > Voice guidance and a language.
Select
> Settings > Maps & Walk > Voice guidance > None.