Within the context of the soliloquy, Juliet expresses her anguish and confusion over Romeo's family name and the resulting societal barriers it imposes on their relationship. By calling into question Romeo's identity and the role it plays in their love story, Juliet is using Romeo's name as a metonym for the larger forces that threaten their happiness. Juliet's lament about why Romeo bears the name of her familial enemy symbolizes the conflict between love and societal obligations, highlighting the theme of star-crossed lovers and the constraints placed upon them by their families and society.
On a broader level, this metaphor transcends Juliet's personal dilemma and conveys the universal human struggle against external circumstances that may hinder one's pursuit of love and happiness. It resonates with the timeless theme of love conquering all and the powerful longing to overcome obstacles to be with the person one loves, regardless of societal norms or expectations.
Through this metaphorical language, Shakespeare crafts a poignant expression of Juliet's heartrending emotions and the deeper implications of their forbidden love, leaving a lasting impact on the hearts and minds of readers and audiences.