We always kind of hated the term "pull request". It's pretty confusing for a beginner, and for a number of years led to the idea that GitHub didn't have code review at all in the product. (For that reason, I always thought we should just call them "Code Reviews", or just "Reviews".) There were a number of attempts to change it, but they all died.
It wasn't until last year when I got a beer with an ex-Atlassian employee when we chatted about this and realized we both had hated the term and had a number of attempts to change the nomenclature, but they fizzled out. Funny how things work out.