In the Meaning of
Arthur we can read:
It could be derived from the Celtic elements artos "bear" combined with viros "man" or rigos "king". I would like to mark that the Celtic
artos not only means "bear", but also "stone", which seems to be more important for the Celtic Culture.
Indeed, it would be, for example, the stone in which is Excalibur previously to be pulled from by the king
Arthur.