Mac Gaynor or Ginver / Irish - Mag Fhionnbhairr - fionnbharr - fair headed / A Sept - Family branch who had their territory in Co. Longford - North - West Leinster / Some Mac Ginvers now known as Mac Ginty as in Co. Monaghan - Southern Ulster / Used with Mag instead of Mac it became Kinure in Eastern Munster.

Mac Geady / Irish - Mag Geadaigh or Eidigh / A Sept - Family branch who had their territory in the north west of Co. Donegal - North West Ulster.

Mac Geaghan or Gegan / Used as variants for Geoghegan, which see.

Mac Geagh / Irish - Mac Eathach or Mag Eachadha / A Sept - Family branch who had their territory in Co. Donegal & Co. Derry - Northern Ulster / See also Mac Gagh & Mac Gahey.

O Geane / Irish - Ui Geibhinn / Used as a variant for O Geaney.

O Geaney / Irish - Ui Geibheannaigh - geibheannach - fettered / A Sept - Family branch who had their territory in Co. Cork - Southern Munster / Occasionally also used for Mac Geaney in Ulster.

Mac Geaney / Irish - Mheic Geibheannaigh / geibheannach - fettered / A Sept - Family branch who had their original territory in Co. Roscommon - Eastern Connacht but were later on in Southern Ulster / See also O Geaney.

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

Mac Gearn / Glenties / A variant used by the Ui Gearain in Co. Donegal - North West Ulster  / See also Sharpe.

O Geartain / Irish - Ui Ghearlanaigh / A Sept - Family branch who had their territory in Co. Louth - North East Leinster.

O Geary / Irish - Ui Ghaorthaidh - wooded valley / A Sept - Family branch who had their territory in Co. Cork - Southern Munster.

O Geary / Irish - Ui Gadhra / They were in Co. Cork - Southern Munster were it was mainly used by a branch of the O Garas, which see, from the Cianachta. *85.Cian.

O Geary / A Sept - Family branch who had their territory in Co. Waterford - North East Munster.

Mac Geary or Gerry / Used as variants for Mac Garry, which see, by one of their Septs - Family branches who had their territory in Co. Armagh & Co.Tyrone - Ulster.

Mac Gee / Irish - Mag Aodha / Aodh anglicized as Hugh / A Sept - Family branch who had their territory in Co. Westmeath - North West Leinster where they were a branch of the Muintir Tlamain.

Mac Gee / Irish - Mag Aodha / Magee / A Sept - Family branch who had their territory in Co. Donegal - North West Ulster and on the Co. Tyrone - Central Ulster border / See also Hughes.

Mac Gee / Mag Aodha / Scottish & Irish origins / Usually spelt Magee in the east of Ulster where is "Island Magee" on the Co. Antrim coast / See also Wynne.

O Geehan / Used as a variant by the Gahans, which see, in Co. Wicklow - South East Leinster

Mac Geehan / Irish - Mheic Gaoithin - gaoth - wind / A Sept - Family branch who had their territory in Co. Donegal - North West Ulster often written Mageean / See also Guihen.

O Geelan / Irish - Ui Giallain / giall - hostage / A Sept - Family branch who had their territory in Co. Leitrim - Northern Connacht.

Mac Geever / Used as a variant for Mac Ivor, which see, in Co. Donegal - North West Ulster.

Mac Geheran / A Sept - Family branch who had their territory in Northern Connacht / Used for Mac Gahern, which see.

Mac Gegan or Geogan / Used as occasional variants for Geoghegan, which see.