Xon

From Memory Alpha, the free Star Trek reference.

Xon was a 23rd century Starfleet captain attached to the Starfleet Academy's Starfleet Training Command.

In 2285, Xon was listed on a directory placard found on the 2nd level of Starfleet Training Command. (Star Trek II: The Wrath of Khan)

Named after the Phase II character Xon.