What does Gitchi Gummi mean?

Answer:
Gitchi (Big) Gummi (Water). American Indians named Lake Superior Gitchi Gummi.
The song by Gordon Lightfoot, The Sinking of the Edmond Fitzgerald, describes the lake in his song.
"The legend lives on from the Chippewa on down
of the big lake they called "Gitche Gumee."
The lake, it is said, never gives up her dead
when the skies of November turn gloomy.
With a load of iron ore twenty-six thousand tons more
than the Edmund Fitzgerald weighed empty,
that good ship and true was a bone to be chewed
when the "Gales of November" came early.