O Geran or Gerin / See Guerin.

De Gernon / See Garland / They were in Co. Monaghan - Southern Ulster and also in Co. Louth - North East Leinster / In 1690 the Anglo Irish Estates of the Gernons were given over to the English Bellinghams.

Mac Gerry / They were in Co. Cavan - Southern Ulster where it was used as a variant for Mac Garry, which see.

Mac Getrick / Irish - Mheic Shitric - Sitric - Norse forename / Used as a variant for Mac Kettrick, which see, peculiar to Co. Sligo - North West Connacht.

Mac Gettigan or Ettigan / Irish - Mag or Ui hEiteagain / A Sept - Family branch who had their territory in Co. Tyrone - Central Ulster and are now mainly in Co. Donegal - North West Ulster.

Getty / They were in Co. Derry & Co. Antrim - North East Ulster exclusively / A variant of the Scottish Dalgetty / Irish - Mag Eitigh.

O Gevany / A Sept - Family branch who had their territory in Co. Galway - Southern Connacht.

Fitz Gibbon / A branch of the Fitz Geralds, which see, White Knights who were associated with Kilmallock in Co. Limerick - North West Munster and the last one Edmond who died in 1608 was buried in a Tomb there at the Dominican Friary / It was sacked often under the Tudors and Oliver Cromwell destroyed the fortifications there / Because Edmond had betrayed his Fitz Gerald kinsmen the Earl of Desmond for a reward of 1,000 pounds from Elizabeth 1st his descendants changed their name to Fitz Gibbon / Later on they produced "Black Jack" Fitz Gibbon the English Earl of Clare who was an English Undertaker and merciless man who was a staunch anti - Catholic / For a very long period he did everything he could to stop Catholic Emancipation and when he died the people in Dublin pelted his coffin with cats.

Mac Gibbon or Gibbons / English origins / Gaelicized as Mheic Giobuin / A branch of the Connacht Burkes, which see, and also utilized by the Fitz Gibbons, which see who dropped the Fitz / For Mac Gibbon in Co. Mayo - Mid West Connacht / See also Fitz Gibbon.

Mac Gibbons / Fitz Giobhuin / Anglo Norman origins / They were in Co. Mayo - Mid Western Connacht / Descended from a son of Gilbert de Burgh who was descended from William Fitz Adelm de Burgo, which see, the ancestor of the Burgh, Burgho, Burke & Mac William, who originally arrived in 1171 and became the English Chief Governor after Strongbow, Richard de Clare.

O Giblin / Originally O Giblellans / Irish - Ui Gibealain / An Ecclesiastic Sept - Family branch in the Elphin Diocese who had their territory in Co Roscommon - Eastern Connacht.

O Gibney / Irish - Ui Gibne / gibne - lock of hair / A Sept - Family branch who had their territory in Co. Cavan - Southern Ulster & Co. Meath - North East Leinster.

Gibson / Scottish origins / With Gibb a branch of the Clan Buchanan who were in Co. Antrim - North East Ulster / Gibson & Gipsey have also been used instead of Giblin.

Mac Giffen / Mag Dhuibhfinn / They were in Co. Antrim, Co. Derry & Co. Tyrone - Ulster in the 17th Century.