[name_m]Hi[/name_m] there.
[name_f]Magnolia[/name_f] is gorgeous!
Here are my thoughts on your list:
[name_u]Sage[/name_u]-You know, I think that this is one of those names that I find too masculine for a girl & too feminine for a boy. It’s definitely more popular for girls.
[name_m]Sebastian[/name_m]-I love this. It’s very distinguished, but also a bit artsy. I loves the nns [name_m]Satch[/name_m] & Bash too. I don’t think that this is particularly unique, but not super over done.
[name_u]Neo[/name_u]-This is okay. It seems really tied to The Matrix.
[name_u]Nico[/name_u]-I like this better. It’s short & sweet, but also a bit exotic.
[name_m]Bodhi[/name_m]-This is not my style, but it’s okay.
[name_m]Miles[/name_m]-This is fine, but way popular.
[name_m]Stellan[/name_m]-I’m not a huge fan. It reminds me of Stalin.
[name_u]Marley[/name_u]-Definitely too feminine.
[name_u]Marlow[/name_u]-Same as above.
[name_u]Linden[/name_u]-I didn’t think that I liked this, but w/[name_f]Magnolia[/name_f] & the tree connection it’s pretty nice.
[name_m]Huck[/name_m]-Hm. I kind of like it, but it seems nick-namey. Not sure what for though…
[name_m]Rainer[/name_m]-See [name_u]Linden[/name_u]! I didn’t think I liked it, but since it has the nature connection it’s kind of cool.
Here are some suggestions:
[name_u]Arlo[/name_u]
[name_m]Basil[/name_m]
[name_m]Bastian[/name_m]
[name_m]Caspar[/name_m]
[name_m]Caius[/name_m]
[name_m]Joaquin[/name_m]
[name_m]Milo[/name_m]
[name_m]Odin[/name_m]
[name_m]Otis[/name_m]
[name_u]Quinn[/name_u]
[name_u]River[/name_u]
[name_u]Rowan[/name_u]
[name_u]Schuyler[/name_u]
[name_u]Shiloh[/name_u]-one of my very favorites that I rarely suggest for fear of over exposure. 
[name_u]Satchel[/name_u]
[name_u]Tristan[/name_u]
[name_m]Thatcher[/name_m]
[name_f]Hope[/name_f] this helps. 