Doppelgänger [ˈdɔpəlˌɡɛŋɐ]

In German, a Doppelgänger is simply a person that physically resembles another person to the extent of mistaken identity. A lookalike. In English, however, it has taken on a broader variety of meanings including: alter ego, ghostly counterpart of a living person or a person with the same name.