Are we talking an in world name or a name used by the downers for the people on joy? By in world I mean, the people on joy, I doubt they'd label themselves the joyous bc it's bad branding. Joy itself is well branded but calling the people on it the joyous just calls attention to the fact they're on drugs. Which to th people pulling the strings would look bad, a reminder to the populace they're being inhibited. Since they call the people off Joy Downers, then maybe the regime in charge would label their people the Uppers. Counter programming to the term Downer basically.