In the story of how Corra Linn on the River Clyde got it"s name we find that Corra, the youngest and at the time unmarried daughter of Malcolm king of Scotland, then an aged man, around the year 1005AD would be soothed to sleep by her harping and singing his favourite lullaby yeclept "The Howlet" [Owl]
This Malcolm was of course the grandfather of Duncan and MacBeth who were cousins.

Not any connection to the matter in hand but may be of some historical interest.