Дьбрꙗньскъ (Old East Slavic) comes from Proto-Slavic dьbrь, from Latin Dubris, from Brythonic Dubras, from Proto-Celtic dubros, from Proto-Indo-European dʰubʰrós, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.