The story
- Proto-Indo-European*h₂ent-
- Proto-Indo-European*h₂énts
- Proto-Germanic*anda-
- Proto-West Germanic*anda-
- Old Englishand-
- Old Englishon-
- Middle Englishon-
- Englishun-
- Englishregister
- English todayunregister
Etymology from Wiktionary, CC BY-SA 4.0.