First, I adore this name as well. I see you have a little one named
Rosemary (my favorite name of all time and what I plan on using to honor my mother if I ever have a girlie of my own), and I think they go really really well together. I would go with
Philippa. It just looks more right. And, I can't think of anything to top
Philippa Iris. What a beautiful, classic combo.