Hi. Dumb question but do you know…Does Negan have a last name? Is Negan his last name? Is he just Negan?? Thanks

Negan is his first name, he had a last name for sure before but it’s unknown.
As far as I know he’s also only Negan in the comics but I’ve only read “Here’s Negan” till now so I’m not a 100% sure they’ve never mentioned it 🙂