My new word for the day is hoodoo, a column of eccentrically shaped rock produced by differential weathering.

This meaning of hoodoo is tertiary to (1) synonym for voodoo, and (2) bad luck.

My Webster's does not suggest the etymology of the word outside of the voodoo context, but I speculate that the fantastic shapes of the geographical hoodoos suggested voodoo spirits to somebody. Can anybody confirm or refute that origin?