וולוין
'Wieluń (in south-central Poland)'

ETYMOLOGY

Beider argues that the vowel was diphthongized due to "anticipatory softening" before a palatalized consonant. The Polish etymon was from a dialect variant in which the /u/ has lowered to /o/ before a nasal.
Polish Wieluń.

VLOyN {Yiddishland, Paul Glasser}