The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Hellenic*ə-
- Ancient Greekἀν- (an-)
- Proto-Indo-European*h₁nómn̥
- Proto-Hellenic*ónomə
- Ancient Greekὄνυμα (ónuma)
- Ancient Greekἀνώνυμος (anṓnumos)
- Late Latinanonymus
- Englishanonymous
- English todayanonymousness
From anonymous + -ness. First attested in the early 19th century.
Etymology from Wiktionary, CC BY-SA 4.0.