My grandfather's grandfather was the baby of a largish family. They had just barely moved to town when the house caught fire. A neighbor managed to get the baby out but the whole rest of the family died. Nobody knew who they were or where they'd come from. No relatives ever came to look. This was in 1800s Maryland, not exactly wilderness, but none of the local county seats had any idea who the family might have been...
Wow, that is strange. There was nothing left from the house that would give any clues, huh?