Hunt the Wumpus
Hunt the Wumpus is an early (1972), beloved game designed for Unix.
The Wabash Cannonball got the name Wumpus decades later, and it was years after that that the coincidence was remarked on. Wabash was never pursued with an arrow, as far as any of us knew, and he did not smell from two rooms away. Clearly a different animal.
The Wuggly Ump
The Wuggly Ump is a character from a poem by Edward Gorey. According to the story, "[i]t eats umbrellas, gunny sacks / Brass doorknobs, mud, and carpet tacks." Also a different animal, but "Wuggly Ump" is so fun to say.
In our household, Wuggly Ump was quickly abbreviated to Wump or Wumps. At some point, it gained the extra vowel that caused the confusion above, but that moment is shrouded in mystery.