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The basic idea is that if the name (in the above example, âJessieâ) is the only thing in the world described by the identifier (âmy oldest friendâ), use a comma before the name (and after it as well, unless youâve come to the end of the sentence). If not, donât use any commas.
I believe many follow this rule: use a comma before but if (and only if) it introduces an independent sentence. This applies to the other coordinating conjunctions too (and, or, and so). She liked him but refused to marry him. She liked him, but she refused to marry him.