Danube
"Danube" is an Old European river name derived from a Proto-Indo-European "*dānu". Other river names from the same root include the Dunaj, Dzvina/Daugava, Don, Donets, Dnieper, Dniestr, Dysna, Tana and Tuoni. In Rigvedic Sanskrit, "dānu" means "fluid, drop", in Avestan, the same word means "river". In the Rigveda, "Dānu" 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.
Deliblato
Deliblato received its name from its situation in the sandy area. According to one theory, the sandy area, in the vastness of the river Danube, became very muddy during long rain periods in ancient times. The road passing through the area had been easier to cross due to the mixing of mud and sand, thus travelers called this place Deliblato. Sloveni however, the notion of the lake marked by the word 'mud' and it is not excluded that the current village got its name from the large pond that lies around it.