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alternatehistory.com
In OTL Austria was original the Bavarian march along the Donau, between the Bavaria proper and Hungary, the are are today known as Upper and Lower Austria. Austria come from the German Österreich (meaning Easten Realm), it name before that had been Ostmark (meaning East March). But it wasn't the only area with that name on the northen side of Bohemia one of the Saxon marches had the same name at the time Ostmark*. So what if that area became known as Österreich/Austria instead. What would our Austria be called, would it keep Ostmark, readopt Pannovia as it was known before or would another name be adopted?
On the other hand would the Saxon Austria disappear again, or would the term be so universal that the later rulers kept it? Saxon Ostmark name was dropped, but on the other hand "realm" beat "march" any day of the week in prestige.
*The area was more or less the later Electorate/Kingdom of Saxony in its pre-Vienna form.