Listed in the USS Enterprise-D's database

Monty de Graff was a notable humanoid comedian.

In 2365, Data attempted to locate a comedian to help him better understand the concept of "what is funny?". De Graff was among the holodeck program files that were contained aboard the USS Enterprise-D. The program list code for this comedian was TE-49234. (TNG: "The Outrageous Okona", okudagram)

This character was only mentioned in writing.
This character was named after production staff member Monty de Graff. (Star Trek: The Next Generation Companion 2nd ed., p. 69)
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