I have long loved
Ernestine and
Geraldine is nice too. I must agree that Walterine doesn't sound nearly as pretty. I do like
Clara Ernestine quite a lot. Other ideas for you (peeking at your PNL)...
Glaudia
GeraldineErnestine BlytheVera Ernestine /
Vera Walterine
Iris ErnestineJulia GeraldineLeda Thomasine
Irina Ernestine (i and e names sound so pretty together; as to c and e names; and l and e names, I have found, generally)
Lydia Thomasine