A DoppelgÃ nger or a doppelganger is a German word used in English to talk about any double or someone that looks exactly like another person â '' most commonly an `` evil twin . '' A doppelgÃ nger is a tangible double of a living person in fiction , folklore , and popular culture that typically represents evil . In the vernacular , the word doppelgÃ nger has come to refer ( as in German `` doppelt ( e ) '' ) to any double or look-alike of a person .