I prefer
Elinor to
Eleanor, but I'd gladly use either. The
Eleanor people I've known - I've never met an
Elinor - have never gone by nns.
Ellie is not to my taste, and though I like
Nora, I don't think of it as a nn.
Eleanor sounds like ELL-ə-naw when said by me. The -r is silent.
Elena doesn't happen where I live.