Hello Margaret,
It seems Charlie only told you half the story, apparently there were four men washed (said to be from the Spanish Armada) the locals cried out "Kiare ruish"that is four naked. The problem with this is that there were Kerruishes in Maughold before the Armada. My father always said that the Kerruishes descended from the followers of Africa Fergusdottir who married Olaf Kleining, they were supposed to have come over from Galloway with her and settled in Maughold, the derivation of the name seems to be MacFergus nd several authors give this one.
Happy New Year
Rick