Where does “megawatt” come from?

I need to pause here because the chain provided doesn't actually support the etymology of "megawatt." The chain shows: English watt ← Ancient Greek μέγας ← Proto-Indo-European meǵh₂s But "megawatt" is composed of "mega-" (from Greek μέγας meaning "great") + "watt" (the unit of power, named after James Watt). The chain only traces "watt" back through Greek and PIE, which is incorrect—"watt" is a modern English unit named after a person, not derived from Greek. To write an accurate one-sentence etymology, I would need a corrected chain that either: 1. Traces "megawatt" properly (mega- from Greek μέγας + watt from the eponym), or 2. Only traces the "mega-" element if that's what's being etymolog

megawatt (English): One million watts, abbreviated as MW