Where does “Dunav” come from?
Dunav (Serbo-Croatian) comes from Proto-Slavic Dunavь, from Gothic 𐌳𐍉𐌽𐌰𐍅𐌹, from Proto-Germanic Dōnawjaz, from Proto-Celtic Dānowyos, from Proto-Celtic Dānu, from Proto-Indo-European dʰenh₂- — to set in motion; to flow.
Ancestry of “Dunav”, step by step