The story
- Proto-Indo-European*dʰwer-
- Proto-Germanic*durz
- Proto-West Germanic*dur
- Old Englishduru
- Middle Englishdore
- Englishdoor
- Proto-Indo-European*mon-
- Proto-Germanic*mann-
- Proto-West Germanic*mann
- Old Englishmann
- Middle Englishman
- English todaydoorman
Etymology from Wiktionary, CC BY-SA 4.0.