Answer:
•This phrase can be translated to "Why must Romeo, The Man I love, Be apart of the rivaling family?"
Juliet is upset because out of all people, the person who just happened to have caught her eye also just happens to be Montague.
•This relates to the rose as she implies with the quote "a rose by any other name would smell just as sweet" that if a rose weren't called a rose it would still smell like a rose. Whether Romeo is Montague or not he is still himself and she will still love him.
•Im not sure what this is asking, so it'd probably just be safe to quote "Trade in your name- which really has nothing to do with you- and take all of me in exchange."