Crux's real name is Amene! From what I had found, Amene can mean "Looking forward with hope", something he tries his best to do after waking up from his coma and eventually when he regains his memories. Crux as a codename on the other hand, can mean a decisive point, but is also something that was used physically as a means of torture, which during his pre amnesia days Crux was known for his brutal interrogations that typically involved psychological torture.

For Valerian, since he's a doctor and works with blood, people and especially kids might be a little bit scared when they have to see him, on account of all the needles and stuff that comes with blood work. In real life,
the valerian is a type of flower that is more recently promoted in things like anxiety relief! His real name Sol, aside from coming from when I was on a Guilty Gear lore binge, was because for Crux and Blaze, when he was born it was like they were staring at the sun, knowing their little boy had a bright future ahead of him.