Note 67 — Chapter IX · Place-name Stories
Reading edition
So it seems probable that the Welsh Ỻyr67 is no other word than the Goidelic genitive Lir, retained in use with its pronunciation modified according to the habits of the Welsh language; and in that case68 it forms comprehensive evidence, that the stories about the Ỻyr family in Welsh legend were Goidelic before they put on a Brythonic garb.