Mac Gifford. Highland Scottish origins. They were in Co. Down in the south - east of the Ulster Province.

Gil. These names usually begin with Kil in the Connacht Province.

Gilbert. There are Gilbert towns in 5 Counties. They were in Co. Louth and Co. Westmeath in Northern Leinster in the 16th Century AD.

Gilbey or Gilboy. English toponymic origins -

O Gilboy or Ogilvy - Irish / Ua Giolla Bhuidhe - buidhe / yellow -

Mac Gilbride. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province. See also Kilbride.

Mac Gilchrist - Irish / Mheic Giolla Chriost (Descended from a son of a devotee of Christ) A Sept / Family branch, who had their territory in the north of the Connacht Province and nearby in Co. Longford in Northern Leinster.

Mac Gilchrist. Highland Scottish origins. They were in the north - east of the Ulster Province.

Mac Gildauff. A Sept / Family branch, who had their territory in Co. Galway in Southern Connacht.

Mac Gildea or Mac Kildea - Irish / Mheic Giolla Dhe - De / God (Descended from a son of a servant of God) A Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill Cenel Conaill Sept / Family branch, who originally had their territory in Tir Conaill (The Land of 88.Conall) in Co. Donegal in the north - west of the Ulster Province who later on moved southwards into the Connacht Province and Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster. In Co. Leitrim in Northern Connacht they are known as Benison. Ancestors - *88.Conall "Gulban" the 1st King of Tir Conaill / Tyrconnell (Cenel Conaill), *87.Niall of the Nine Hostages the 126th King of Tara / Ireland (Ui Niaill).

Giles. They were in Youghal in Co. Cork in the south - east of the Munster Province.

Giles. The Irish Ua Glaisne Sept / Family branch used this name to anglicize in Co. Louth in the north - east of Northern Leinster.

Giles. English origins. Elsewhere then Co. Louth in the north - east of Northern Leinster and Co. Galway in Southern Connacht.

Giles. May also be for the Irish / Mheic Goill Sept / Family branch, who had their territory in Co. Galway in Southern Connacht.

Mac Gilfinnen. A Sept / Family branch, who had their territory in Co. Fermanagh in the south - west of the Ulster Province where they were Kings.

Mac Gilfoyle or Powell - Irish / Mheic Giolla Phoil (Descended from a son of a devotee of St. Paul) A Sept / Family branch, who had their territory in the Heberian Cianacht kingdom of Ely O Carroll in Co. Offaly in the north - west of Southern Leinster and also nearby in Co. Tipperary in Ormond / Aur Mhumhain / North Eastern Munster.

O Gilga - Irish / Ua Giollagain. A Sept / Family branch, who had their territory in the north of Co. Leitrim and nearby in Co. Sligo in the north - west of the Connacht Province. No connection with Mac Gilligan.

O Gilgan - Irish / Ua Giollagain. A Sept / Family branch, who had their territory in Co. Leitrim and nearby in Co. Sligo in the north of the Connacht Province. No connection to Mac Gilligan.

Mac Gilgar or Kilgar - Irish / Mheic Giolla Gheairr - gearr / short. A Sept / Family branch, who had their territory in Northern Connacht.

Mac Gilheany. Used as a variant for Mac Ilhenny, which see, in the Heremonian Ui Cobhthaigh Dal Cuinn Ui Briuin kingdom of Breifne in Co. Leitrim in Northern Connacht

Mac Gilhooly - Irish / Mheic Giolla Ghuala - guala / shoulder. A Sept / Family branch of the O Mulveys, which see, who had their territory in Co. Leitrim and Co. Roscommon in the north - east of the Connacht Province. Abbreviated to Gilhool in Co. Sligo in the north - west of Connacht. One of their Septs also settled into Co. Limerick in the mid - north - west of Thomond / Northern Munster.

Gilkinson. They were in Co. Tyrone in Central Ulster - Irish / Mheic Uilicin. See also - Quilkin or it could also be derived from Gilchrist, which see, as a forename.