Wiener

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early 20th century: abbreviation of German Wienerwurst ‘Vienna sausage’.

wiktionary

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From German Wienerwurst, from Wiener(“of Vienna, Viennese”) +‎ Wurst(“sausage”), because sausages were originally made in Vienna, Austria.

In Germany today this sausage is known as Wiener Würstchen(“small sausage from Vienna”), but in Vienna it is called a Frankfurter(“from Frankfurt”).

etymonline

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wiener (n.)

1900, shortening of wienerwurst (1874, American English), from German Wiener "of Vienna" (from Wien "Vienna," from Latin Vindo-bona; see Vienna) + Wurst "sausage" (see wurst). Colloquial wienie is attested by 1911. Extensive pejorative senses developed from its penis-like shape. Wiener roast is from 1910.