Is there any JAVA library or API that returns the language spoken in a city? For example in Switzerland there are some spoken languages such as German, French and Italian. However I need to know exactly in a specific city which language people mostly speak.
I am writing a code in Java that it is required to know exactly the main language of a city since our clients might be from all over the world it is important to have the exact correct answer. I have the countries’ most spoken language but I need the cities’ language.

Thanks a million