Greskrendtregk is the Ktarian husband of Ensign Samantha Wildman. He was left behind when she vanished on the USS Voyager. His daughter, Naomi Wildman, was born in the Delta Quadrant. (VOY: "Deadlock")
Samantha had considered naming her child after Greskrendregtk, had the child been a son; the name is an honored one in her husband's family (he is the fifth generation male of his family line to have that name).
Numerous references were made about him throughout Voyager. It seems he remained on Deep Space 9 for some time after Voyager's departure. He may also have been a member of the station's crew.