Dubhán was a 5th-century Brittonic priest and pilgrim, for whom Hook Head (originally Rinn Dubháin) is named.
[1] Rinn Dubháin, (Dubhán's point), is named for him (literally "little black [haired] one").
[3] Antiquarian and historian John Francis Shearman agrees that Dubhán came from Wales and identifies him with Saint Dyfnan, who in the Book of Leinster, is listed as one of the many sons of the Welsh king Brychan.
As Dyfnan is reputed to be buried on Anglesey, [4] Shearman speculates that Dubhán must have at some point retired to his home country.
While a number of saints of his name are listed in various martyrologies, none can be connected with Dubhán of Killooaun.