Middle name for Daphne?

DH and I have decided on Daphne as the first name for baby #2, if we have another girl. Yes, we are aware of the possible Scooby-Doo connection others might make. We are 100% set on the name, so please be kind. :)

Big sister’s name is Caroline Ruth. Our last name is Sullivan, and we’re struggling to find a middle name that flows well. We would prefer to stay away from common “filler” names (Anne, Marie, Grace, Rose, etc.) They’re beautiful, just not what we are looking for. Any suggestions? Thank you in advance!