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That's interesting! My personal folk-etymological conjecture had long been that "val" had had a proto-germanic sense of "big", leading to to other modern words like Walroß or Walfisch.

Your comment sent me on a brief etymological excursion and the words sadly are indeed utterly unrelated.

I still can't tell what point you want to make. English hell and Norse Hel are the same thing. But Norse Hel and Norse Valhalla aren't, unless you want to trace them back to proto-Indo-European *kel. There's not a connection between hell and Valhalla.

Consider that languages don't develop in isolation, and both the pre-conquest inhabitatns of the Isles and the Saxons had regular interactions with the Norse, where its religious/spiritual connotations could very easily have just become a cognate.