Fear of litigation from the owners of Gumby

Ancient pact with the old gods.

fr/ i think it's because dummy and dumb are two different words, even though now we use them in the same context.

dummy meaning a replica of a person, meaning someone who isn't original in design or thought,

dumb meaning you can't talk, which has shifted to meaning someone who is of low intelligence.

The actual answer is that the "b" in "dumby" is difficult to pronounce clearly and so people would end up slurring over it, resulting in a pronunciation that sounds like "dummy".

Person of bad takes.

The same reason that we call a corpse that has been embalmed and wrapped in linen a mummy and not a mumby.

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Becuzz I like dubble letters