Danube once appears as the mother of Vrtra, "a dragon blocking the course of the rivers." The Finnish word for Danube is Tonava, which is most likely derived from the word for the river in Swedish and German, "Donau". Its Sámi name "Deatnu" means "Great River". It is possible that "dānu" in Scythian as in Avestan was a generic word for "river": "Dnieper" and "Dniestr", from "Danapris" and "Danastius", are presumed to continue Scythian "*dānu apara" "far river" and "*dānu nazdya-" "near river", respectively. The river was known to the ancient Greeks as the "Istros" (Ἴστρος) a borrowing from a Daco-Thracian
The Blue Danube After the original music was written, the words were added by the Choral Association's poet, Joseph Weyl. Strauss later added more music, and Weyl needed to change some of the words. Strauss adapted it into a purely orchestral version for the 1867 Paris World's Fair, and it became a great success in this form. The instrumental version is by far the most commonly performed today. An alternate text was written by , "" (Danube so blue). "The Blue Danube" premiered in the United States in its instrumental version on 1 July 1867 in New York, and in Great Britain in