In the play, Rosaline was Romeo's first love. I think that sounds lovely. We have a grey tabby cat named Romeo and last year we adopted a female look-alike. I wanted to name her Juliet but my husband vetoed that idea as being just too cutesy for words. He instead named her Prozac. I definitely like Juliet and Rosaline for your two little ladies - it's a lot better than naming one after an antidepressant drug.