
1) Celtic boy name 2) Welsh mythology
Found on
https://www.crosswordclues.com/clue/hefeydd

In Welsh mythology, Hefeydd the Old was the father of Rhiannon. - Hen, according to legend, he was first king of Dyfed and tried to force her to marry against her will to Gwawl. She met Pwyll of Dyfed and fell in love, planning to marry in one year and one day at his court on his estate. In accordance with the plan, they tried to marry but were th...
Found on
http://en.wikipedia.org/wiki/Hefeydd
No exact match found.