There are 8 active sentient races native to the Eastern Chaos Wastes.
The Tyrant
The Frail
The Mind (Htnalihin)
Trogg
Gigothics
Raptors
Shifters
Faen
in addition, the slave races of the Tyrants who gained their freedom also live throughout the continent:
Centaur
Runa
Red
Satyr
Naga
Valdire
Tarracula