Sen’s name was five name changes before I was happy with it. LOL
I don’t know where it came from. I just kinda thought it up.
Thallia’s name was not, in fact, from mythology or Percy Jackson, like so many assumed. I honestly didn’t even know either of those were a thing when I came up with her name. She was the twin sister of Thalassar, my bf’s character, and so when we created them, Thallia seemed to be a good name for a twin based off of his character’s name.
Destrien’s name is from my Jedi Knight in SWTOR. I borrowed a few names from my characters there.
Azryl… I dunno. It just kinda came into existence.
Endred’s name is homage to a friend I used to raid and RP with back in BC. 
So that’s guild lead and my four “main” characters. I have too many others outside of that. And none of them have interesting origins. Just creative names I came up with.