First of all I was talkign about berserkers in general, not specifically Southern Germanic berserkers. Secondly you are wrong, it is very likely the early Southern Germanics also had berserkers since there are references to similiar warriors and they shared religious system with the Norse culture (common gods etc)
Berserk is composed of 2 words: ber and serk. Ber means bear (or bare according to some). Serk literally means clothing material or dress or night dress (see picture). Actually it is "särk". Reason I translated it to cape was to make the translation clearer to non-norse speakers since "särk" is a pretty flexible word and in this case it would have the shape of a cape.
Translating särk as skin is of course completely nonsense and extremely idiotic and ignorant. Point is my translations is 10x better than yours.
Technically berserk could also mean berry dress...
No it is not, that is an anglicized attempt to make the word looks strange and foreign, there would be no "r" at the end of the word unless it is in plural and that last "s" need to be replaced by an "a" if it is a Nordic language. Correct spelling is: "bärsärkagång"
That is obviously ********, try out some mushrooms and report back if it turns you into a berserker, ok?

There you go, plain as day.