They have less mainstream ones, with the Lanterns having the most famous of the bunch.
Atrocitus, Bleez, Sinestro, Necron, Parallax, etc.
I dunno. I only know Sinestro. And that's just because of the Injustice game.
Like, I for some reason know Cheetah and Captain Cold. I feel like DC did a poor job with that Justice League cartoon. That's how a lot of people would be introduced to DC.