I'd expect that people who speak Cantonese would use Cantonese, and people who speak Mandarin would use Mandarin pronunciation. When you see a name "Peter", how

I'd expect that people who speak Cantonese would use Cantonese, and people who speak Mandarin would use Mandarin pronunciation. When you see a name "Peter", how do you know which pronunciation to use - Dutch, German, Norwegian, English, or other (there's a couple more)? :-)