The Collaborative International Dictionary of English v.0.48:
Llyr \Llyr\ prop. n. (Welsh mythology) the sea personified, father of Manawydan; corresponds to the Irish Ler. [WordNet 1.5]WordNet (r) 3.0 (2006):
Llyr n 1: Celtic deity who was the father of Manawydan; corresponds to Irish Lir