Wikipedia
Gráinne is the daughter of Cormac mac Airt in the Fenian Cycle of Irish mythology. She is one of the central figures in the Middle Irish text Finn and Gráinne and most famously, in the 17th-century tale The Pursuit of Diarmuid and Gráinne, which tells of her betrothal to Fionn mac Cumhaill, leader of the Fianna, and her subsequent elopement with Fionn's warrior Diarmuid Ua Duibhne.
Gráinne, or Grainne, may refer to:
Gráinne is a feminine given name in the Irish language. The name is of an uncertain origin, although it is possible that it may be connected with the word grán, meaning "grain", and thus refer to an ancient corn goddess. The name is borne by a character in Irish mythology— Gráinne, who was the daughter of Cormac mac Airt, a legendary High King of Ireland.
The name can be Latinised as Grania; and can be Anglicised as Granya. The name Gráinne can also be represented in English as Grace, Gertrude, and Gertie. These English names are etymologically unrelated to Gráinne.