The story
- Proto-Indo-European*de
- Proto-Indo-European*déh₁
- Proto-Italic*dē
- Latindē
- Latindē-
- Proto-Indo-European*h₁nómn̥
- Proto-Italic*nōmn̥
- Latinnōmen
- Latinnōminō
- Latindēnōminō
- Late Latindēnōminātor
- English todaydenominator
Learned borrowing from Late Latin dēnōminātor (“that which names”).
Etymology from Wiktionary, CC BY-SA 4.0.