My grandmother was
Kathryn Inez.
My soon-to-be niece will be
Kathryn Joyce after my grandmother and my mom. I know you plan to use a different spelling of
Kathryn but I think
Inez and
Joyce both sound pretty with Kathryn/Catherine. Other names I find pretty that are legitimate but a little more unusual:
Catherine Aurora Catherine Elaina
Catherine ElaineCatherine AylaCatherine Azura or Azora
Catherine BellaCatherine EleanorCatherine EstelleCatherine FionaCatherine IsoldeCahterine
MaeveCatherine Alessandra (or
Alexandra)
Catherine Zaida