Katherine, of course!
Alexandra is soooooo overused. I know a class (I am a teacher) with 2 Alexandras that go by
Alex. And the other division of that same grade has an
Alexis!
I realize they will have an age gap between you and your child, but I don't think the namenos falling in popularity
Goo old names like
Susan, Katherime,
Mary,
Anna are falling in popularity.