Middle Name Suggestions?

My husband and I love the name(s)- Emmeline, Emeline, Emmaline,ect (pronounced Emma- Line) and for a boy Xavier (pronounced X- avier) the only problem is we can NOT agree on middle names. We REALLY love unusual and different names. My first daughters name is Genevieve Avalon. It's kinda medieval like! And we would kinda like to keep that "theme" I guess. I'm not too crazy about names like Micheal, Rose, Grace, and Scott, so any unique suggestions out there? Thanks!