Except Spider-Verse Miles is still quintessentiallty Miles Morales.
His uncle is still Aaron Davis, The Prowler, a relentless criminal. His dad is still a cop. He still gets bit by a spider before witnessing the, and blaming himself for, the death of Peter Parker, and he's still mentored by other superheroes two of the most important being an alternate universe Peter Parker and a female spider-person.
Its still Miles Morales, its just that they stripped away all of the garbage and took what worked and what was interesting and made it a better Miles Morales. If it was an OC, it'd just be a blatant ripoff of Miles Morales, sure done better, but very clearly him with a different name.