Anthony Barrett
The Morgan name has a long history in Wales, but now DNA and some recorded history says their origin is from the Emerald Island.
The Morgan story [dominated by DNA tribal marker R1b-L513, Subgroup B2] can trace their origins to the Finn Valley in Donegal, Ireland from 50 BCE. Perhaps the journey begins with the Clanna Dedad; Deda, son of Sen or Deda Mac Sin.
The Morgan surname origin is from Clan Domnaill [DNA Tribe R1b-L513, Subgroup B1] and relations who remain in Ireland take the modern surname (O’)Donnelly, McDonald and Donohue in Ireland. The Domnaill name is also found in Brittany, France according to research from the Centre de Recherche Bretonne et Celtique. It is a very old name which appears in the 5th century Roman inscript