Ideas for names?

We have already decided that the first born boy will be named after my SO and be nicknamed jr. So they will have the same initials. But because of genetics we have been told that multiples are a possibility for us so I want the boys initials to match their daddy’s and I want the girls to match mine. But I’m having trouble with making first and middle names flow. My name is Kathryn Elizabeth. Can y’all give me ideas for my daughter?