Off that list, my favorites are
Cedar and
Linden, though I don't like
Cece as a nn. I agree Arizona sounds more feminine, but
Ari is more neutral.
Here are my ideas
Kestrel - like this for a boy or a girl, no nicknames I love jumping out though
Phoenix - feels more masculine to me, but could go either way. Maybe it isn't as simple a spelling though. Nix/Nixie?
True - I don't hold the Kardashian against it
Arden - feels more feminine to me, but if you like the sound of Dresden
Aspen - Azzie?
Lupin - probably some pretty strong
Harry Potter associations, but
Peregrine - I could see this work for either.
Perry is a cute nn.
Everest - similarity to
Everett makes it feel pretty masculine, but Ev,
Evie could be feminine
Vesper - I just like it
Starling - I think it's kind of cute. However some people don't like starlings
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https://www.behindthename.com/pnl/120652