Borrowed from Old East Slavic Дунаи (Dunai), Дꙋнаи (Dunai), from Proto-Slavic *Dunavь, from Gothic *𐌳𐍉𐌽𐌰𐍅𐌹 (*dōnawi), from Proto-Germanic *Dōnawjaz, from Proto-Celtic *Dānowyos (whence also Danubius), an extended form of the river-name *Dānu, from Proto-Indo-European *déh₂nu (“river goddess”), akin to *dʰenh₂- (“to set in motion; to flow”).