Tangentially, I've seen a couple people use "CoPilot" here instead of "Copilot" (the actual product name). Where does the Pascal case inspired variant come fro

Tangentially, I've seen a couple people use "CoPilot" here instead of "Copilot" (the actual product name). Where does the Pascal case inspired variant come from? Is it a reference to something? Is it like "M$" was used back in the days?