Gillagori appears to be otherwise unknown. His surname may be an early form of Ó Dubhagáin. They were a bardic family from Baile Uí Dhubhagáin (Ballyduggan), near Loughrea, County Galway.

More notable bearers of the name would include Seán Mór Ó Dubhagáin (died 1372), Patrick Duggan, Bishop of Clonfert (died 1896), and Winston Dugan, 1st Baron Dugan of Victoria (1876–1951).

Gillagori appears to be the last-known abbot of Aran.

• Inishmore

• Annals of the Four Masters
• Irish Surnames johngrenham.com
• Cormican Irish Website