Where's Azizi when you need her?
Is not MacAnanty very close indeed to Mac Anansi?
For the King of the Faeries to be the son of the Trickster God , known in West Africa as "Anansi the Spider" is very plausible, and for the more romantic would allow the creation of all sorts of Atlantean links (or more conventional ones) between West African and Celtiberian mythology.
Cheers
Dave