Multiple realities(covers information from several alternate timelines)
Christopher Sarion was a Starfleet officer in the 24th century. His serial number was WI-900-8930 KKM.
In 2371, he was a crewmember aboard the USS Voyager. He was among the crew stranded in the Delta Quadrant, when Voyager was forcefully brought there by the Caretaker.
His name was listed on the crew roster display read by Harry Kim in early 2372. (VOY: "Non Sequitur")
This character was only mentioned in writing.