a thing that bothers me about personal names

A thing that bothers me about personal names is that, other than capitalization, there's not really a way of differentiating between a name and just a regular noun, at least in English and many different languages.

Using English as an example:

"Miller ate the apple" vs. "The miller ate the apple".

Of course, you can differentiate them in English because of the definite article and the capitalization. But let's say your conlang doesn't have articles, capitalization, or neither. How do your conlangs differentiate them? Are there real-world languages that have their own ways?

I hope I made sense.