I don't think I can completely answer everything but there is a myth that Vikings only originate from the Scandinavian region, they were Norse seafarers so were well travelled and would have a lot of mixed DNA.

They got as far as Mediterranean, North Africa, the Middle East, and North America.

Someone might correct me but I thought Saxon was Germanic?

“A lot of the Vikings are mixed individuals” with ancestry from both Southern Europe and Scandinavia, for example, or even a mix of Sami (Indigenous Scandinavian) and European ancestry."

"Researchers also discovered a second-degree family connection between a Viking in a Danish cemetery and another in Oxford, England—proof of how mobile family members were during the era."

https://www.nationalgeographic.com/h...-genetic-roots