The story
- Proto-Indo-European*upó
- Proto-Italic*supo
- Latinsub
- Latinsub-
- Englishsub-
- Proto-Indo-European*per-der.?
- Proto-Indo-European*pér
- Proto-Indo-European*pró
- Proto-Indo-European*pro-
- Proto-Italic*pro-
- Proto-Indo-European*preyH-
- Proto-Indo-European*priHós
- Proto-Italic*prijos
- Proto-Italic*proprijos
- Latinpropriu
- Anglo-Normanpropre
- Middle Englishpropre
- Englishproper
- English todaysubproper
Etymology from Wiktionary, CC BY-SA 4.0.