I prefer not to associate the name Saber-Scorpion with my old Star Wars fan fiction these days, so if I were ever to re-post the fanfic anywhere, I would probably change the name to my secondary default of "Red Scorpion", or similar. As to his birth name, I really have no idea. I don't remember if I ever gave him one in the story. I guess if I had to come up with a SW name on the spot, I'd go with uh... Jax Sunder. Yeah, that sounds cool.
In Disney Canon there is Crimson Corsair/Red Raider, a pirate captain wearing red Kaleesh mask (Grievous' race). Not as badass as Saber/Red Scorpion, but still someone who I like, even his actual species doesnt interest me much.
Jax Sunder... that sounds perfectly fitting to the SW galaxy Kinda remember what you wrote for his background, a stormtrooper who fought on Endor. I think