*wesuz is a pseudo word, without any real base and created only to build a *pseudo history. You just try to ignore the real Gothic word Vesi to replace it with some *pseudo. This is very typical pseudo science and pseudo linguist Finnish N1c -Mongoloids like Jaakko Häkkinen are doing when they try to "prove" them (N1c) as original Finnish and Goths etc. as original "IE-speaking". However, N1c- types are genetic isolates in Finland and in Europe and they just don´t fit in to the picture in anyway.The etymology of Visigoth, at least the Vesi part has been suggested (by Mallory & Adams) to trace back to Proto-Germanic *wesuz from Proto-IE *h₁wésus, which would be cognate of Proto-Celtic *wesus, Italic goddess Vesuna and Sanskrit vasu, all having some rough meaning of "good" or "excellent". The Visigoths most certainly were not one of the Sea People, the Sea People in all likelihood are an Eastern Mediterranean people (Philistines show Aegean ancestry), at this time the Visigoths, or any Goths were not known.
The etymology for "Germanic" is not totally agreed upon, however it is likely it comes from a Gaulish term, which considering the context of Julius Caesar's writings that would make far more sense than the etymological route you have given.
You don´t seem to understand that Goths, or originally Katti, Chatti, Gatha(some clan or trait)Vesi etc. was a very ancient tribe, which developed in Khemi aka Ancient Egypt as did all the Aryan tribes Vanais, Rus etc. They just didn´t pop up on Rome or Viking boats from nowhere, but had already history of c. 2700 before Visigoths become known in Central and South Europe. Visi is just a Latin form of Vesi. :useless:
And yes, one group of the Sea People originated from Greece, being subdued by Danai (Vanai, Vanir). But most of the Sea People Lukka, Teres, Ruka, Wesh (Vesi), Danai etc. were Finno- Aryan people. Is it that hard? :useless:
There was a clear difference between IE-speaking hunter-gatherers (R1b and I) and R1a- farmers/ metal cultural, developers of sciences Aryans in antiquity. They just didn´t mix with IE-hunter-gatherers, or very seldom, hardly ever in Europe. Every anthropologist can tell you this. Nowadays there is a real problem because these R1b, I and lately also N1c present themselves as "especialists" with Aryans´history and culture. Please, they´re just ignorant crap. Really.