The word "wraith" is first attested in 1513, with the meaning of "ghost or spectre" (that is, an apparition of a living or once-living being, possibly as a portent of death). In 18th century Scotland it was applied to aquatic spirits. Over time, it came to be used in a metaphoric sense to refer to wraith-like things, and to portents in general.
http://en.wikipedia.org/wiki/Wraith
My favorite car in that movie was the second gen firebird..