Not sure if you still need the clarification but basically here is the cliff notes (Spoilers for volume 1)His official name is Antonio or "Tony." but after he found out about Jack's blog and reminded Jack that using his real name would be a big privacy violation (And potential evidence for the several Kifer murders) Jack changed the name to Carlos on the blog. If you want to know more buy the books.
Not sure if you still need the clarification but basically here is the cliff notes (Spoilers for volume 1) His official name is Antonio or "Tony." but after he found out about Jack's blog and reminded Jack that using his real name would be a big privacy violation (And potential evidence for the several Kifer murders) Jack changed the name to Carlos on the blog. If you want to know more buy the books.