Crewman Davis was a Starfleet crewmember aboard the USS Enterprise-A under Captain Kirk.
In 2293, Crewman Davis's locker was located next to Crewman Dax's locker when the magnetic boots used in the assassination of Chancellor Gorkon were discovered. (Star Trek VI: The Undiscovered Country)
A locker with the name "Davis" was clearly shown when the magnetic boots were found in the crew quarters.