The wendigo, "the spirit of the lonely places", is a cannibalistic spirit in Algonquin(a native American tribe) mythology. It is said that a human can change into a wendigo when they indulge in cannibalism, or that a wendigo can posses a human. Some sources say that the possession causes the transformation, or that it can also happen when bitten by one, I'm no expert.
Some people think that it is another version of the Bigfoot myth, but it seems a bit more complex than that to me.
While hunting, the wendigo follows its prey, always just out of sight, until it gets a chance to pounce.
The name Wendigo seems to be popular, I had trouble finding anything besides camps golf clubs and bands.
As for appearance, it is quite often described as a tall thin humanish thing, sometimes said to be twisted, bloodstained, or fanged. Some also say that it is a spirit that inhabits evil men. Also they are said to have a heart of ice so fireor melting this heart in some way was the only way to kill them.