Note 17 — Chapter II · The Fairies’ Revenge (continued 2)
Reading edition
It is more likely that it is a shortening of Ỻyn y Barfog, meaning the Lake of the Bearded One, Lacus Barbati as it were, the Bearded One being somebody like the hairy monster of another lake mentioned at p. 18 above, or him of the white beard pictured at p. 127. ↑