As a native German and French speaker, this is actually an issue for me.
If I see a common German or French name, I do not actually know how it would be pronounced in English and it's very difficult for me to guess or get my head to think of that pronunciation in an 'English' way.
This is especially difficult when talking about a third person who you might not know well/at all: "I think a John Dubois, based in the X Office, is tech lead for that service"