Nerthus, Mannus, Tuisto and Semnones

Question:

Is the -us ending in the Germanic deities Nerthus and Mannus recorded by
Tacitus Latin Nominative? What would they have originally been in
Germanic? Nertha or Nerth and Manna or Mann?

Also, various translations pf Tacitus have given both Tuisto and Tuisco.
Which is correct, and do we know the original Germanic form?

And finally, what is the Germanic etymology of the tribal name Semnones?

-Michael

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