Noa seems odd. I prefer
Noah (for a guy/girl).
Nicola: all I can think of is the soda. If you're looking for a fancier spin,
Nikola is the original name, I believe.
Selene is pretty but sounds old-fashioned.
Selena sounds more modern but not necessarily better.
Bellamy gives me a similar idea to
Mallory. Someone living in Kentucky who loves the cows. Idk.
Bellamy for a guy is what I prefer over for a girl. It's still not my favorite but I wouldn't question if I met someone with this name.
Xander: cute and sweet in my opinion, sounds better than
Alexander. Any name with "X" to start seems fun and edgy, too.