Crewman Hrrii'ush Uuvu'it was a Betelgeusian Starfleet enlisted crewman who served aboard the USS Enterprise in the 2270s as a member of the science staff. He was part of the multi-species crew recruited by Captain Willard Decker. (TOS novel: Ex Machina, TOS movie, novelization & comic adaptation: The Motion Picture)
In 2274, Crewman Uuvu'it had been promoted to Petty Officer 3rd Class. Despite being enlisted, Petty Officer Uuvu'it had been selected by acting First officer Hikaru Sulu to serve as the bridge science officer during Commander Spock's leave of absence. Upon Spock's return, Petty Officer Uuvu'it became the ship's gamma shift science officer; Uuvu'it viewed it as a demotion, but he was reassured by Lt. Cmdr. Sulu and Dr. Reiko Onami that it wasn't. (DTI novel: Forgotten History)