The name is derived from the actor Steven Seagal and his character Casey Ryback in the 1992 film Under Siege, where Seagal played a ex special forces guy who was a cook aboard a US aircraft carrier. Near Ryback is a level 30 cooking vendor. This is a reference to the character Jordan Tate in the same movie played by the actress Erika Eleniac. Stormwind guards refer to the film by saying "From the way he handles a knife, I don't think he was always a chef."
See List of Stormwind NPCs.