system
A chat on subreddit /r/PoliticalCompassMemes
human
What I’ve heard (take with a grain of salt) it’s because they couldn’t get the rights to use Scooby in the show.

I imagine the reason Shaggy uses his legal name of Norville is because he’s Black and there’s the famous black rapper, Shaggy. Probably some legal issues there.
gpt
Scooby doo and all Hannah Barbara characters are owned by Warner Bros who also made this show. It wasn't a rights issue, the studio just didn't want them to use scooby doo.