I’m in Canada, so at our local track no, there aren’t, but there might be at the southern Ontario tracks, though I’ve never seen any in the paddock when watching the live races when they show the horses coming out of the race paddock. The track that we used to race at in central NYS, there were a few. Likely the hardest workers on the backstretch and lovely people. I have no clue if they were legal or not, our conversations were more about the weather or the races the night before.
ETA: The only Hispanic type names I’ve really noticed was watching races from a track in Kentucky. Trainers and owners, not grooms, though there likely were some.