"Doppelganger" is German for "double walker" or a ghostly double or counterpart of a living person.
I guess I have one, my Mom and most all the family have seen me walking through the hall when I was either gone or up here in my room. They say if you see your doppelganger it means you will die soon. also means bringer of bad luck (I get plenty of that)
In Norse mythology, a vardøger is a ghostly double who precedes a living person and is seen performing their actions in advance. In Finnish mythology, this is called having an etiäinen, i.e., "a firstcomer.
This is wild!!!