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).

Etymology: from the German Wienerwurst, meaning sausage: W iener comes from a pairing of Wiener (“of Vienna”, “Viennese”) and Wurst (“sausage”). And that’s because sausages originally come from (were made in) the Austrian city of Vienna. Its pejorative sense comes from the wiener ‘s distinctive penis-like shape.

The source of the other name that is spelled Weiner is Yiddish, and according to dictionaries of Jewish surnames, it originates from the Yiddish name Vayner, meaning wine merchant, and related to the German word Wein, which means “wine”. Both the Yiddish name and the German word are pronounced with the same vowel as the English word.

There is a German name Weiner that comes from a dialectal pronunciation of Wagner, related to Waggoner, meaning wagon-maker. But Anthony Weiner is Jewish, and according to dictionaries of Jewish surnames, his name probably originates from the Yiddish name Vayner, meaning wine merchant.