I like
Cadence, and can't decide if I prefer it on a girl or a boy. I think Cady is a nice nn for a girl, and I love
Cade for a boy.
Cadence Kate wouldn't be great ... I'm glad you realize this ;P
As an alternative to
Louise, how about
Cadence Louisa? It seems to flow a little better and I find
Louisa less stuffy and outdated for some reason.