That's not lore. That's speculation and fanfiction with a little Gacha Life mixed in. You might as well say his real name's Vincent for all I care. No one knows his real intentions.
THIS IS WILLIAM AFTON.
HE DOESN'T HAVE FRIENDS.
HE DIES BUT HE DOESN'T.
HE HATES KIDS.
HE GETS BURNT TO A CRISP IN A BUILDING BUT DRAGS HIMSELF OUT WITH HIS REMAINING ARM.
HE RETURNS FROM HECK TO PROVE HOW MUCH HE DOESN'T LIKE KIDS. DON'T BE LIKE WILLIAM AFTON.