1) Celtic deity 2) Goddess of rivers 3) Sea and river goddess 4) Tuatha Dé Danann 
Boann or Boand (modern spelling: Bóinn) is the Irish goddess of the River Boyne, a river in Leinster, Ireland. According to the Lebor Gabála Érenn she was the daughter of Delbáeth, son of Elada, of the Tuatha Dé Danann. Her husband is variously Nechtan, Elcmar or Nuada Airgetlám. Her lover is the Dagda, by whom she had her son, Aengus. In or...
In Irish mythology, Boann is the goddess of rivers.
[n] - (Irish) goddess
noun Celtic goddess; mother of Angus Og