Gabbett. Originally Gabot. English origins. They have been in Co. Limerick in the mid - north - west of the Munster  Province in the Mid - 17th Century AD.

Mac Gaffey - Irish / Mheic Gaibhidh - gaibhidh / acquisition. A Sept / Family branch, who had their territory in the south - east of the Connacht Province near Athlone in Co. Westmeath in the south - west of Northern Leinster. Also see Mac Gahey.

O Gaffney. May be either of the Irish Septs / Ua Gamhna, Ua Caibheanaigh, Mheic Conghamhna, Mheic Carrghamhna or Mag Fhachtna. See also Caulfield, Keaveney, Mac Carron and Gaughney. They were a Sept / Family branch, who had their territory in Co. Kilkenny in the south - west of Southern Leinster.

Mac Gaffney or Mac Caron - Irish / Mheic Carrghamhna. A Sept / Family branch, who had their territory in Co. Cavan in Southern Ulster and nearby in Co. Roscommon in the east of the Connacht Province.

Mac Gaffney or Caulfield - Irish / Mheic Conghamhna. A Heremonian Ui Cobhthaigh Dal Cuinn "Southern" Ui Fiachrach Aidhne Sept / Family branch, who had their territory in the south of Co. Galway in Southern Connacht. Ancestors - *87.Fiachra the original 2nd King of Connacht  (Ui Fiachrach), *86.Eochy "Mugmedon"  the 124th King of Tara / Ireland.

Mac Gaffrey - Irish / Mheic Gadfraidh. Used as a variant for Mac Caffrey, which see, who were a Sept / Family branch, who had their territory in Co. Leitrim in Northern Connacht.

Mac Gagh - Irish / Mag Eathach. A Sept / Family branch, who had their territory in Co. Galway and nearby in Co. Mayo in the south - west of/ the Connacht Province. Known as Mac Gaff nearby in Co. Offaly in the north - west of Southern Leinster. Also see Mac Gahey.

O Gahan - Irish / Ua Gaoithin - gaoth / wind. A Sept / Family branch, who had their territory in Co. Wexford and nearby in Co. Wicklow in the south- east of Southern Leinster where they were Kings. Also sometimes used as a variant for O Gaughan, which see.

Mac Gahan or Mac Geehan or Mageehan / Mheic Gaethain, An Irian Laeghis Ui Laoighis Sept / Family branch of the O More / O Moore / Ui Mordha who are also kinsmen to O Brophy / O Brofie / Ui Broithe, O Cashin / O Kissane / Ui Casain, O Deegan / Ui Duibhgainn, O Doran / O Dorrian / Ui Deoradhain, O Dowling / Ui Dunlaing, Mac Keady / Mac Keadie / Mac Keddy / Mac Keedie / Mac Keedy / Mackeady / Mheic Ceadach, O Harrigan / O Harraghan / O Harahan / Ui hArraghain, Ui Liathain, O Lalor / O Lawlor / Ui Leathlobhair, Mac Lee / Mac Lea / Ui Laoidhigh, O Swords / O Sord / O Sourdes / O Suard / Ui Suaird who had their territory in Co. Laois in the mid - north - west of Southern Leinster. Ancestors - *83.Fachtna, *82.Milige, *81.Bran, *80.Eircc "hUbulchind," *79.Felim / Feidlimid mheic Finnchad, *78.Fiachach "Uanchind," *77.Daire, 76.Rossa, *75.Ogomain, *74.Fergus, *73.Muleist, *72.Fachtna, *71.Milige (Ui Baccan), *70.Intait, *69.Lugdach "Loichsi" / Laoiseach "Ceann Mor" the ancestor of the O More / Moore / Siol Morda Sept in Co. Laois (named for him) in the north - west of Southern Leinster who were among the ”7 Septs of Laois, *68.Conall "Cernach" - of the Victories the leader of the Knights of the Red Branch of Ulster who is the direct ancestor of the Mac Guinness, Mac Gowan and many other Irian Families in the Ulster Province and the Connacht Province. (He was a contemporary of Cuchulainn), *67.Aimhirgin "Larghiunach," *66.Cas, *65.Fachtna, *64.Cathbladh, *63.Cionga,  *62.Rory / Ruaidri “Mor” - the Greater who died in 218 BC as the Irian 86th King of Tara / Erinn the direct ancestor of the Irian Families from the (Clann - na - Rory) Sept descended from *37.Ir Irians).

Mac Gahan or Mac Gahon - Irish / Mheic Eachrain. A Sept / Family branch, who had their territory in the Heremonian Ui Cobhthaigh Dal Cuinn 3 Colla kingdom of Orghialla / Airghialla - Oriel in Southern Ulster and nearby in Co. Louth in the north - east of Northern Leinster.

Mac Gahern or Mac Gaughran - Irish / Mheic Eachrain. A Sept / Family branch, who had their territory in Co. Cavan in Southern Ulster. Sometimes confused with Mac Gauran.

Mac Gahey - Irish / Mheic Eachaidh. Anglicized as Aghey and a variant of the older Eochaidh / Eochy / Oghy. An Ulster Province name akin to Mac Caughey, which see. A Sept / Family branch, who had their territory in Co. Monaghan in Southern Ulster. See also - Hackett.

Mac Gaitens or Mac Gattins. Used in Co. Donegal in the north west of the Ulster Province as synonyms for Mac Gettigan, which see.

Galbally or Galball / de Gallbhaile - Irish toponymic origins. They were in Co. Kildare in Central Southern Leinster in 1359 AD.

Galbraith. Scottish origins. They where in Co. Tyrone and nearby in Co. Fermanagh in the south - west of the Ulster Province and came with the Confiscation of the 3,500,000 acres of the Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill territories there and the Foreign non - Catholic Plantations of Ulster in 1609 AD. Gaelic Irish / Mheic an Breathnaigh - Breathneach (Descended from a son of a Welshman) One branch settled in Co. Laois in the north - west of Southern Leinster another nearby in Co. Galway in Southern Connacht, but are still mainly found in Co. Laois.

Gale. They were in the Leinster Province without the prefix Mac. See also Gaule.

Mac Gale or Mac Gall. Used as variants for Mac Call, which see, in the Ulster Province especially in Co. Tyrone.

O Gallagher - Irish / Ua Gallchobhair - gallchobhar - gall / foreign - chobhar / help. The main Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill Cineal Conaill Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province. They were directly descended from the most senior branch of the "Northern" Ui Niaill Cenel Conaill (The Family of *88.Conall.) During the 14th to the 16th Centuries AD they were the commanders of the cavalry for their "Northern" Ui Niaill kinsmen the O Donnells / Ui Domhnaill. There are 23 variant spellings some with Gol instead of Gal. Ancestors - *88.Conal "Gulban" the 1st King of Tir Conaill (Cenel Conaill), *87.Niall of the Nine Hostages the 126th King of Tara / Ireland (Ui Niaill).

O Gallaher. They were Chiefs in Co. Donegal in the north - west of the Ulster Province. See o O Gallagher.

O Gallahue - Irish / Ua Gallchu. Used as a variant for O Gallagher, which see, and in the east of Co. Cork in Desmond / Southern Munster confused with O Donohue.