Sometimes we use both languages in English. For instance if an English-speaking person is talking about Italian football, they’d talk about a game between Napoli and Roma, for instance, never between Naples and Rome. And while we use the English word when describing the Spanish city of Sevilla, we use Spanish when speaking about the football team.
And then there’s the weird case of FC Bayern München, which is often referred to in English as Bayern Munich. Bayern is just the German word for Bavaria, so logically we should either use the German term, or translate both words and say Bavaria Munich.
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