Creiddylad
Welsh: cree-THIL-ahd

Lludd's daughter, though Jeffrey Gantz in his translation of Culhwch ac Olwen believes her name to be the origin of Cordelia in King Lear. In this tale, she is battled over by two jealous lovers--Gwythern and Gwyn ap Nudd. They fight every Calan Mai, as prescribed by King Arthur, until the end of the world. Given this circumstance, is thought that she may be another version of the flower maiden, similar to Blathnat, Blodeuwedd, and Iseult, among others.

The confusion between Lludd and Llyr only adds to my own belief that Lludd is a confluence of Nudd and Llŷr into one god.

SOURCES
Gantz, Jeffrey. The Mabinogion. NY: Penguin, 1976.