I was JUST thinking about this and had a nearly identical exchange with a friend of mine over a sci-fi series we've been reading.
Humanity finally reverse engineered "kinetic fields" which allow the creation of force shields, synthetic gravity, stasis chambers, and the arbitrary conversation of energy into thrust WITHOUT a reaction mass, and we relatively promptly built VTOL vehicles that made traditional helicopters obsolete...
... But in the canon of the setting, nobody was coming up with a better name for the new vehicles than "helicopter", it was simply that no other names stuck.
But I realized that since Kinetic Force Emitters work via electrostatic means, we would probably have to call them Electrostatopters and god DAMN that feels awful to say. So like ... No wonder they kept calling them copters.