FINALLY FOUND THE CAP IN CONTEXT! 
It's really official!

Her name is legit Samantha! 
(Or, technically, her middle name, ig)
So what does this mean for Evil? 
Is "Neuro" a shared sorta name, so the identifying name is the middle name?
So, she took Neuro [Evelyn|Kayori] Vedal and calls herself
"Evil" Neuro [Evelyn|Kayori] Vedal?
Is "Neuro" an identifying name, and "Samantha" is purely just a middle name?
"Evil" [Evelyn|Kayori] Vedal?
If "Neuro" is a first name and not some sorta shared name (such as twins with only differing middle names, which is somewhat strange unto its own right), is "Evil" her first name, a persona, or just her way to act edgy, using her name, by changing it?
In this case, it makes the most sense that Evil is:
Evelyn Kayori Vedal, but she made it
Evelyn "Evil" [goth persona] (Kayori -- her chuunibyou demon possessor) Vedal, I think.
In conclusion, Neuro is:
- Neuro Samantha Vedal (confirmed)

And Evil is one of:
- "Evil" Neuro [Evelyn|Kayori] Vedal
- "Evil" Evelyn Kayori Vedal
- "Evil" Evelyn Vedal (possessed by the Demon Queen of the Nether Realms, Kayori
)
IMO, it's obvious she is a chuunibyou acting goth, so I think the first or third one is the most logical. Or a combination:
Neuro Evelyn Vedal -> chuuni mode -> Evelyn EVIL Kayori, Queen of the Nether Realms Vedal (Because she drops her real names, Neuro and Vedal
, and changes her middle name, Evelyn, to "Evil"
; and then, she adds in her Japan-obsessed chuuni demon name
, Kayori, with the Demon Queen's title) 

🐴