Also, a branch of people are called Jhereg.(You can tell if he means the animal or the people by the capitalization) Also in the books by Steven Brust, these people are the lowest house and are mainly involved in black market type business. Such as: Assassins, Thieves, Pimps, and they run gambling houses and many other things.
Vladimir is an Easterner (human)who became a Jhereg when his father spent his life earnings to buy a title in the House Jhereg.
Jhereg Hustler: I think one of my wizards betrayed me...
Another Jhereg: Well what did you expect from a Jhereg.