Styx
Either Male or Female
The meaning of the name Styx is Shuddering
The origin of the name Styx is Greek
Notes:
In Greek mythology the Styx is the river that forms the boundary between the underworld and the world of the living. It's also the name of the goddess/nymph who is the personification of the River Styx.
Styx is also the name of an American rock band, with hits like "Mr. Roboto" and "Come Sail Away"