McFly's gravestone
McFly was the name of a resident of Caldos colony who had passed away some time prior to 2370.
His gravestone was in the same cemetery where Felisa Howard was laid to rest. In that year, the area around McFly's grave was the scene of a battle between Felisa's granddaughter Beverly Crusher and an anaphasic lifeform named Ronin. (TNG: "Sub Rosa")
This character was only mentioned in writing.
The gravestones bore in-joke references to various science fiction characters. (Star Trek: The Next Generation Companion (2nd ed., p. 280)) This one was a nod to the McFly family of the Back to the Future series of films.