When I first heard someone described as a "household name," I figured it must mean that they have a mop or blender of some other household appliance named after them. Like a Dinah Shore toaster or a Johnny Cash stove.
A childhood belief about speaking

others believed things like this
- I thought that the name of singer "Dinah Shore" was "Dinosauer" and that she must be awfully old.— Sandy
- I used to think you had to be an adult to drink household chemicalsAnon
- I used to wonder what kind of insect "uncles" were named after.
I had "Ants" figured out.— Kimberly in AZ - I used to believe "mixed breeds" of dogs were made by two dogs being put in a blender— Andie
- I used to think that the toast would never pop out of the toaster if you watched it while you were waiting.Anon
- When I was little, I was told that God made people of every color.....I was sure he used a big toaster.— stormy