I still think that Viedna is the most-widely understood name for this old Slavic city. By the way the name of Viena and Venezia come from the same: "Wenden", which is another name for Slavs who have founded these two cities. Just look in Encyclopedia Britannica which clearly states that entire Austria and Bavaria (!!!) were originally SLAVIC! And just look at the official pages of Venice, which admit that Slavs have founded the city.
By the way did you know that the first part of Danube, which originates in Bavaria near the French border is called BREG?????????????????? That proves that all of Bavaria was inhabited by Slavs, they just don't want to admit it and always give credit to somebody else.
There are very many toponyms of Slavic origin in Germany and nobody tries to deny it. Though Vienna was populated since about 500 BC, much time before Slavs appeared there.
Of course Austria was a Slavic territory for some time. These lands were marches, i.e. territories controlled by German nobelity (Markgrafen) but having non-Germanic (Slavic) population. Adolf Hitler knew it very well, and it was one of the reason of why he renamed Austria to Ostmark. Slavs lived there; though they weren't the first, and they weren't the last.
It's interesting to note that Slavs seem to have gained revenge on Germans in the 20th century. Compare the contemporary map with the one of 100 years ago. The boundaries of German states were shifted many hundreds kilometres westward; many millions of Germans were forced to leave the territory of nowadays' Russia, Poland, Czechia, and former Yugoslavia; Germany itself has as large Slavic population now as it never had before. If it's a tendention, then in yet a hundred years you will claim that French Brest obviously is related to Belarusian one.
But about Bavaria being near the French border... I must admit, here you got me. I checked several maps, and they all are wrong! Thanx for opening my eyes.