Dr. Harry Covington was the father of Janice Covington and an archaeologist, who worked with Melinda Pappas father. He was usually known as a grave-robber, but the rumours were denied by Janice.
If Harry and his daughter are direct descendants of Gabrielle, then he must be a descendant of a child Gabrielle produced after Xena died, since Gabrielle's daughter, Hope, only produced one child, The Destroyer, who was killed before he could produce any children of his own. Otherwise, Harry could be a distant relative of Gabrielle's, possibly descended from Gabrielle's sister, Lila or her niece, Sarah.