>>514938397
The christian concept of hell is based on the Greco-Roman Tartaros, which is non-existent in judaism (jews barely believe in an afterlife at all) and not really explained in the new testament.
Christianity has committed the despicable sin of conflating Hades/Hel (the afterlife for normies) with Tartaros (the deepest pits of hell where the absolute worst of the worst go to get tortured), while also insisting that you can get to Elysium/Valhal by obeying jews (you can't).
They've made two out of what was three, and made themselves the gatekeepers of the best option.

The word 'hell' comes, as you say, from the Germanic 'Hel', but it means the same thing as Hades. We don't know if the Germanics had a concept of Tartaros or not, but it is likely.