premise: Findabair or Finnabair (modern Irish Fionnabhair ] ) was a daughter of Ailill and Queen Medb of Connacht in Irish mythology. The meaning of the name is "white phantom" (etymologically cognate with "Gwenhwyfar", the original Welsh form of Guinevere). The Dindsenchas also mention a Findabair that is the daughter of Lugaid Laigde.
hypothesis: Findabair was the daughter of different people in different stories
reason: The Didsenchas changed the story, I tried to make it sound vague