Waton,
We are both correct on where the origin of Nazi comes from.
The term was adopted from the German word for "National Socialist" which is "Nationalsozialist." It was shortened to "Nazi" for short.
But it was also a word already in use, originally meaning someone who came "directly from the land," originally a native but later a farmer and then later a "commoner." At times viewed as more of an insult by wealthier classes as the term "commoner" became a synonym for "peasant" as well, etymologically it came from the name "Ignatius," which means someone who was of Ashkenazi descent. The "natius" is merely a transliterated form of "nazi," the last part of the word.
The term was somewhat of a "reclaiming" of what has become a derogatory term, such as when "queer" was adopted by some members of the LGBTQ community. For instance, the term "Queer Theology" is now common in the LGBTQ community to describe Christian theology that counters claims against homosexuality.
I have not much to add to the other comments you make, as there is question whether Dan or any other of the "Ten Tribes" ever existed. They could be a myth. But I have heard similar crazy ideas from people, like Mormons and those who grasp the straws of Armstrongism.
And I gather you are merely making reference in your last part of your comments about what is being read in the Jehovah's Witnesses religion programs, yes? I haven't been to a Kingdom Hall in about over 30 years, so I will have to take your word on what the Witnesses believe today on those matters. But it's interesting they are reading that right now.