I never knew anything about the name or word
Parnel, so that's news to me. But if that was my name and I found out what it meant, I don't think I'd like it. Do you like
Petronel at all (seeing as it's related to
Parnel)? I think I'd totally prefer
Nell on its own to Parnell nn
Nell. And I like
Harper Lee, but I don't love
Nelle (though it's better than
Parnel, too, imo). I like
Nell best as a nn for
Eleanor or
Penelope, personally, but those are a tad bit dull. ;)