Manawydan fab Llŷr is a figure of Welsh mythology, the son of Llŷr and the brother of Brân the Blessed and Brânwen. The first element in his name is cognate with the stem of the name of the Irish sea
Manawyddan is hanging a mouse
Manannán or Manann, also known as Manannán mac Lir, is a sea god, warrior and king of the otherworld in Gaelic mythology who is one of the Tuatha Dé Danann.
Manawydan
…son of Llŷr and the brother of Brân the Blessed and Brânwen. The first element in his name is cognate with the stem of the name of the Irish sea god Manannán mac Lir, and likely originated from the same Celtic deity as Manannán. Unlike Manannán, however, no surviving material connects him with the sea in any way…
Manannán mac Lir, sculpture by John Sutton at Gortmore, Magilligan, County Londonderry, Northern Ireland.
The boat from the 1st century BC Broighter Hoard, which was found near Magilligan and may be a votive offering to Manannán
Stephen Reid's illustration of the Sons of Tuireann in Manannán's boat
South Barrule, reputed home of Manannán on the Isle of Man