PEP generally stands for Python Enhancement Proposal -- PEP 8 isn't the only one.

I harumphed when I saw the acronym PEP, because of Python's prior use. And I've harumphed a few times in recent years because of similar multiple-use of names and acronyms. Enscript comes to mind. https://en.wikipedia.org/wiki/Enscript

But as computer and internet use becomes more a part of daily existence, we're just going to have to get used to it. People who are involved in niche communities, even those whose names and products came first (like Python's PEPs) are just going to have to get used to mentally shifting context.