From a Gaulish *Rēnos (which was also the source of Proto-Germanic *Rīnaz). The Greek form is recorded in Strabo's Geographica (1.4.3), written between 20 BC and AD 20, slightly later than the Latin equivalent Rhenus (Cicerio, In Pisonem, ca. 55 BC).
(post 1st cenury BC): IPA: /rínos/
- the river Rhine