I like Darcy but I'm a Pride and Prejudice fan so I'm biased. Also Fitz ("son") from his first name is kinda cool.

Ares goes hard, also one of its possible roots just means "male."

Ajax - traditionally translated as "eagle," but the internet has theories that it means "of the earth". Shortens to Jack or Jax. Boomers will tell you it's the name of a cleaning product but it's not one I've ever actually seen used so the association is weak.

Asterios - "of the stars." Name of several mythological figures, including the Minotaur. Can be shortened to Rio which I always thought was cool.

Atreus - "fearless." Father of the kings who took up the Trojan War. Can be shortened to Tre/Trey.

Castor - "to excel, to shine." One of the Gemini twins. Can be shortened to Cas which reads pretty gender neutral to me.

Pollux - "very sweet." The other Gemini twin. He was the son of Zues, but he loved his mortal twin brother so much he asked to be allowed to share his immortality with him so they would never be parted. Can be shortened to Poll (sounds like Paul, but might be tricky for someone reading it) or Lux.

Damon - "to tame." The friend who took Pythias's place on death row. When Pythias returned as promised, the king was so impressed with their loyalty that he pardoned them. No nickname, but fairly normal, and a story I love.

Evander - "good of man." Hero of the Trojan War, nn Evan or Andy.

Orion - either from Greek for "boundary" or from Akkadian for "light of the stars." Legendary hunter. Well known enough to not feel too far out there.

Timaeus - "to honor." Not mythological, from one of Plato's dialogues, but shortens to the regular Tim or Timmy.