The History of Germanic Languages

The names of the week were adopted before the anglo saxons migrated to britain. So these are very old germanic words, which predate old english. And this might also account for some of the confusion as to which goddess was used as the source for the name of friday in the various germanic languages. Now that leaves us with the final day, which the romans named after the planet and god saturn. Apparently the germanic tribes didn't have an equivalent god for saturn, or at least not one that they wanted to use to make this substitution. So they kept the roman god saturn, and we ended up with saturn's