Nipru
The legend has it that Vladimir ordered the wooden figures of Perun (the Thunder God) and other pagan gods dumped into the Dnieper River during the mass Baptism of Kyiv. The disheartened Kyivans, though accepting the baptism, ran along the Dnieper River calling for the old gods to emerge from water ("Перуне выдуби!"). Accordingly, the area down the river stream where Perun emerged was named "Vydubichu" or "Vydubychi" in modern Ukrainian.