There was one survivor besides Private Ryan, Pvt. Richard Reiben, played by Edwards Burns.
Here's something I found online:
The real "Ryan" was Sgt. Frederick (Fritz) Niland who, with some other members of the 101st, was inadvertently dropped too far inland. They eventually made their own way back to their unit at Carentan, where the Chaplain, Lt. Col. Father Francis Sampson, told Niland about the death of his three brothers, two at Normandy and one in the Far East. Under the US War Department's Sole Survivor Policy, brought about following the death of five Sullivan brothers serving on the same ship, Fr. Sampson arranged passage back to Britain and thereafter to his parents, Augusta and Michael Niland, in Tonawanda, New York. There was no behind-the-lines rescue mission, his mother was not a widow, nor is she believed to have received all three telegrams together. Additionally, the brother believed killed in the Far East turned out to have been captured and later returned home. Fr. Francis Sampson wrote about Niland and the story of the 101st, in his 1958 book, Look Out Below! (ISBN 1877702005).