Where does “וואָלגאַ” come from?

וואָלגאַ (Yiddish) comes from Russian Во́лга, from Proto-Slavic vьlga, from Proto-Slavic vьlgъkъ, from Proto-Indo-European welg- — wet, damp.

Ancestry of “וואָלגאַ”, step by step

StepLanguageWordMeaning
1RussianВо́лгаVolga mid-size Russian automobile often used as a taxi
2Proto-Slavicvьlga—
3Proto-Slavicvьlgъkъmoist, damp, humid, wet
4Proto-Indo-Europeanwelg-wet, damp
Every word from Proto-Indo-European welg- →Every word from Proto-Slavic vьlgъkъ →Every word from Proto-Slavic vьlga →