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Re: Origin of name: "Arthur"
Searle uses secondary compilations, but the primary sources are all 11th C. - Arthor, a bondsman of Aelfric archbishop of York, Arthur, a moneyer of William I in the York mint, Arnthor/Arthur, moneyer of AEthelred II (these from coins, that of William I appears as Althur or arthul [since -thul is nonsense it must be Arthur or Harthulf, the latter moneyer in York appears as Haroulf, artholf and Hrthoulf]), and an Artur mentioned in the Domesday book as Lord in Boxsted, Essex (open Domesday records the name as Arthur, but the manuscript has Artur). There is also an "Arthur the Frenchman" in this period (I have no context for this though and it may be the same as the Artur of Boxsted) The balance of evidence points to it being a Danish name introduced to Britain (esp. York) by Danish settlers in the 9th C. and similarly to France in the 10th C.

This message was edited 8/29/2020, 9:31 AM

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That would be a credible origin if there were a surviving Danish cognate, however if there were then the origin wouldn't be so speculative. A name being introduced by Danish settlers and becoming so ubiquitous in Welsh folklore but completely disappearing from Denmark itself is not likely.
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Almost all the names from this era have disappeared completely, and many were never recorded (the same goes for contemporary Welsh names). "Ubiquitous" is a stretch, a mention in a few poems and mythologoical histories of one individual, later expanded and made popular in Medieval romances, v. 4 or 5 rather anonymous individuals in Anglo-Danish Britain and France. We know of a number only because their names are recorded on coins as the "moneyer" - as new hoards are found, new names are discovered nowhere else recorded. There are, at a minimum, probably 100,000 Germanic dithematic names. But the names, and (gendered deuterothemes) recorded are almost always the of important men, less often women, rarely those of common men such as the moneyers and bondsman we know named Arthor/Arnthor, practically never those of common women. Consider Hals- (holy), by the number of places named Helsing (including Helsinki) once a very common prototheme in Scandinavia, but otherwise completely unrecorded except for a single name, and that not in Scandinavia, but Britain.
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"Almost all the names from this era have disappeared completely"That's... not even slightly true. There is a huge record of Viking names, from the period of the Danelaw.The idea that Arthur is Norse in origin is pure conjecture.
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Everything about the fictional Arthur, and the Arthur of the Welsh poems and mythologies is pure conjecture. What is not pure conjecture is several real individuals, not in Wales or Cumbria but in the Danelaw and Norman England, who ARE named Arthur/Arthor/Arnthor. These individuals have ostensibly Norse/Anglo-Norse names, not Roman or British names that might have been used 5-600 years earlier.
Now when you said "disappeared" I assumed you meant "ceased being used" not "were not recorded", however, while both are true of most names that were presumably used (although we have a lot of names, these represent a tiny fraction of the population and are biased toward wealthier men - we know from later recorded place names and family names, there must have been far more), neither is true of Arthor — the Norse name was recorded in Scandinavia, and its variants (Arnor, Arndor, Arnthor) are still being used to this day. Ar-/Arn- are regular variants comparable to Bear/Beorn, both variants are recorded as terms for "eagle" in Norse, and both are used as name elements, in Saxon Britain and the Continent.
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