‘Wiener’, of course, is a person from Wien (Vienna). It is also short for Wienerwurst – Vienna sausage; or in common usage, a hot dog.
But many people spell it weiner; which should be pronounced ‘wine-er’. M-W says that ‘weiner’ is an acceptable alternative spelling for ‘wiener’. My automatic spell-check objects.
When did ‘weiner’ become an acceptable spelling?