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According to the website (which is in Japanese and auto-translated) Keen's favourite food is Guinness Stew, their special skill is hurling, and they have two fairy assistants called Banshee and Far Gorta. https://t.co/Uh3zzTBJEu
I like that buí sounds like a bee because bees are mostly yellow and make yellow honey. I know there's no etymological link, I just think it's nice.
One of the names for a bunting (the bird, not the decoration) is 'Brian na Giolcaí' which translates literally as Brian of the Reeds.