Captain J. Swift was a Starfleet officer in the 24th century. Swift was the commander of the USS Yosemite.
In 2370, Swift was listed on the Deep Space 9 arrival roster. (DS9: "Whispers", production art)
This character was only mentioned in writing.
This character was listed in an okudagram graphic of an arrival roster on a viewscreen. The graphic was also populated by some other in-jokes. He was named for Jonathan Swift, famous Irish writer and satirist.