The story
- Proto-Celtic · derived from*dubros“water”
- Latin · derived fromDurius
- Old Galician-Portuguese · derived fromDoiro
- Portuguese · borrowed fromDouro
- English todayDouro
Borrowed from Portuguese Douro, from Old Galician-Portuguese Doiro, from Latin Durius, possibly from Proto-Celtic *dubros (“water”).
Words from the same roots
Proto-Celtic*dubros all →
Doverdeerness
Etymology from Wiktionary, CC BY-SA 4.0.