Remy Sharp just posted to Google Plus about how he came up with the name of Polyfills. It is fairly obvious but probably something work keeping record of, you all know how rumours can change things!
Original post: https://plus.google.com/u/0/109330852418236875528/posts/3YMEPcAGBny
Where polyfill came from / on coining the term
Shim, to me, meant a piece of code that you could add that would fix some functionality, but it would most often have it’s own API. I wanted something you could drop in and it would silently work (remember the old shim.gif? that required you actually inserted the image to fix empty `td` cells – I wanted something that did that for me automatically).
Also for me, the product Polyfilla (spackling in the US) is a paste that can be put in to walls to cover cracks and holes. I really liked that idea of visualising how we’re fixing the browser. Once the wall is flat, you can paint as you please or wallpaper to your heart’s content.
I had some feedback that the “word should be changed” but it’s more that the community at the time needed a word, like we needed Ajax, HTML5, Web 2.0 – something to hang our ideas off. Regardless of whether the word is a perfect fit or not, it’s proven it has legs and developers and designers understand the concepts.
I intentionally never really pushed the term out there, I just dropped it in a few key places (most notably the book), and I think it’s when +Paul Irish gave a presentation some (many?) months later, directly referencing the term polyfill, was when the term really got a large amount of exposure (I think this was also helped with the addition of the Modernizr HTML5 shims & polyfill page).