Where does “Ве́на” come from?

Ве́на (Russian) comes from Italian Vienna, from Latin Vindobona, from Gaulish *Windobona.

Ancestry of “Ве́на”, step by step

Step	Language	Word	Meaning
1	Italian	Vienna	—
2	Latin	Vindobona	—
3	Gaulish	*Windobona	—