Bialy

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Yiddish, from Białystok, where such bread was originally made.

wiktionary

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From Yiddish ביאַלי‎ (byali), from the Polish name of the city of Białystok.

etymonline

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bialy (n.)

bagel with onion flakes sprinkled on it, by 1936, ultimately short for Białystok, city in modern Poland. The city is named for the Biała river (literally White River), that flows past it, from Polish biały "white" + stok "slope."