J. Gump was a Starfleet officer in the 24th century. She was the commander of the USS Hispaniola.
In 2370, she was listed on the Deep Space 9 arrival roster. (DS9: "Whispers", production art)
The name was not mentioned in dialog; it was simply listed in an okudagram graphic of an arrival roster on a viewscreen. The name is likely a reference to the character Jenny Gump from Forrest Gump. (citation needed • edit) The graphic was also populated by a number of other in-jokes. The ship's "USS" prefix suggests it was a Starfleet vessel.