קוזמאַרק
'Kazimierz (district in Kraków, once site of the Jewish quarter)'

ETYMOLOGY

Beider suggests that the name was borrowed from Old Polish, before the 16th c., when the first vowel of Kazimierz was long /aː/ (perhaps the vowel was lengthened in a stressed syllable before two consonants of which the first is a sibilant). The vowel merged with A₂ and had the corresponding different realizations in Yiddish dialects (e.g., "Kuzmark" in CY).

KU:ZMARK [Yiddishland, Paul Glasser]