His Welsh equivalent is Manawydan ap Llyr. He is also called Barinthus.
Manannan mac Lir
The Irish god of the sea and fertility, who forecasts the weather. He is older than the Tuatha Dé Danann, yet was considered to be one of them. He is the son of Lir and his name means "Manannan Son of the Sea". His wife is Fand and he is the foster-father of many gods, including Lugh. He is the guardian of the Blessed Isles, and the ruler of Mag Mell. Manannan has a ship that follows his command without sails; his cloak makes him invisible; his helmet is made of flames and his sword cannot be turned from its mark. He is described as riding over the sea in a chariot.