Giolla Ceallaigh mac Comhaltan (fl.
10th century) was an ancestor to the MacGiolla Ceallaigh (Kilkelly family of County Galway).
Giolla Cellaigh - devotee of Saint Ceallaigh - was a member of the Uí Fiachrach Aidhne of south Galway, and was a six-time great-grandson of Guaire Aidne mac Colmáin, King of Connacht (died 663).
MacLysaght states This family were hereditary olaves (ollamh) to the O'Flahertys.
The family are mentioned in this regard in the medieval text Crichaireacht cinedach nduchasa Muintiri Murchada.