The best response to the question is:
It expresses that Romeo’s good qualities are an inherent part of him and more important than his name.
This analogy emphasizes that a person’s identity and worth are not defined solely by their name or family background, which is significant given the feud between the Montagues and Capulets in the play. Juliet’s statement reflects her understanding that love transcends these social labels and that Romeo’s essence, like the scent of a rose, remains unchanged regardless of his name.