Avery and
Eleanor don't sound like sisters. I'd be more inclined to think that
Avery was a boy in this case, but if matching isn't too much of an issue, I say go for it.
Eleanor is a beautiful name.
Out of your combos, I like
Eleanor Josephine and
Eleanor Charlotte the best.
More ideas (hopefully at least one of these will also honor a relative of yours somehow):
Eleanor SophiaEleanor JoannaEleanor MaeveEleanor May /
Mae - I prefer
May /
Mae to
Maisie.
Eleanor SimoneEleanor SusannahEleanor Katherine /
CatherineEleanor ClaireEleanor CamilleEleanor Vivian /
Vivien /
VivienneEleanor VioletEleanor Madeline /
Madeleine