Jormunreck, the entire Volsung family and of course Attila (Atli in the sagas) are all Central European characters. Germans are called "Southern speakers" in the sagas - so apparently German, English, Norse, were all one sprachbund at the time, one big community sharing the same basic language and customs to some degree.
But we have to thank the Icelanders for preserving the old legends. Without them they'd be almost completely gone. Snorri in particular has done a wonderful job. I can read Old English now reasonably well and Old Norse is almost the same language, so I'll learn that next and start studying the texts in the original Norse.
I bought the 13th Century sword for a few reasons: mainly that it was 120$ cheaper than a 12th Century sword they were selling, and 200$ cheaper than a Migration Era sword. In fact, the 13th Century sword follows a pattern starting in the Viking Age by the Franks where the guard got longer and the blade more tapered. It will do. I am also interested in Sword and Buckler fencing, so this sword is applicable to this style. Snorri would have had this kind of sword, I guess. The Norse were still there in the 13th Century and it was they who were writing the sagas we love so much. I don't see the 13th Century as being after the "end of the Vikings". Heck, the Vikings are still there today! I don't have anything against the High Middle Ages, hehehe.