Where does “Dvina” come from?

Dvina (Northern) comes from Old Norse dvína, from Proto-Germanic dwīnaną, from Proto-Indo-European dgʷhey- — to disappear, die.

Ancestry of “Dvina”, step by step

StepLanguageWordMeaning
1Old Norsedvína—
2Proto-Germanicdwīnanąto dwindle, to disappear
3Proto-Indo-Europeandgʷhey-to disappear, die
Every word from Proto-Indo-European dgʷhey- →Every word from Proto-Germanic dwīnaną →Every word from Old Norse dvína →