Greacen or Grayson - grieve / steward. They were in Co. Monaghan in Southern Ulster.

Mac Gread or Mac Grade. Abbreviated variants  for Mac Grady, which see, used in the west of the Ulster Province. Occasionally used as a synonym also for Mac Grath, which see.

Mac Gready or Mac Greedy - Irish / Mag Riada. Corrupted also later to Ui Griada. A Sept / Family branch, who had their territory in Co. Mayo and nearby in Co. Roscommon in Mid Connacht Province. For Gready see also Grady.

Mac Greal. Originally Irish / Mheic Neill. Mag Reill now used. They were a galloglass / mercenary Family in Co. Mayo and Co. Leitrim in the Connacht Province.

Mag Grealish - Irish / Mag Riallghuis. A form used in the Connacht Province for Mac Nelis. Some also known in the Ulster Province as Mac Grellis or Mac Grillis.

Mac Greally - Irish / Mag Raoghallaigh - raoghallach. Used as a variant for Reilly - Irish / Raghallaigh, which see. Greally without the Mac was used in Co. Galway and nearby in Co. Mayo in the south - west of the Connacht Province.

O Greaney - Irish / Ua Grainne. A Sept / Family branch, who had their territory in Co. Kerry in the south - west of Iar Mhumhain / Western Munster Province. In the Connacht Province the Mac is used. See also Graney.

Greave. See - Greeves.

O Greehy - Irish / Ua Griocha. Used as a variant for Griffey, which see - Irish / Ui Griobhtha. A Sept / Family branch, who had their territory in the east of Co. Cork in Desmond / Des Mhumhain / Southern Munster and nearby in the west of Co. Waterford in the south - east of Munster.

Green. - Contact Albert Greene from Corcomroe in Co. Clare in the north - west of the Munster Province who specialized in tracking down the Green (e) men and women.

Green or Greene. English origins. Also see Honeen, Mac Green, Fahy, Mac Alesher, Mac Glashan, Greenan and Guerin. Also used as an O Sullivan, which see, agnomen - glas - naithne - green / glas - grey green. Anglicized from many sources in Ireland, including the O Hooneys - Irish / Ui hUaithnigh in Co. Cork in Desmond / Des Mhumhain / Southern Munster. See also Greenan.

Green. Anglicized from O Honeen - Irish / Ui hUaithin - O Honan, which see, in Co. Clare in the north - west of the Munster Province who are a Heberian Dal gCais Sept / Family branch. Ancestor - *91.Cas (Dal gCais) the King of Thomond.

Green. Originally Mac Glashan or Mac Glaisain - Irish / Mheic Ghiolla Ghlais. A Sept / Family branch, who had their territory in Co. Derry  in the north - west of the Ulster Province.

Green. Originally Mac Illesher or Mac Alesher - Irish / Mheic Giolla Laisir. A Sept / Family branch, who had their territory in Co. Fermanagh in the south - west of the Ulster Province.

Green - Irish / Ua Glasheen. A Sept / Family branch, who had their territory in the south east of Co. Cork in Desmond / Des Mhumhain / Southern Munster who are now mostly to be found in Co Tipperary in the north - east of Ormond / North Eastern Munster.

Green - Irish / Ua Grianna or Mheic Griana. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province.

Green. Originally O Fahy or O Faghy - Irish / Ua Faithaig. A Heremonian Ui Cobhthaigh Dal Cuinn Ui Maine Sept / Family branch, who had their territory around Loughrea in their kingdom of Pobal Muintir Ui Fhathaigh / Fahys Village. Ancestors - 86.Maine "Mor" (Ui Maine), *85.Murray / Muiredach "Tireach" the 122nd King of Tara / Ireland, *80.Conn of the Hundred Battles the 110th King of Tara / Ireland (Dal Cuinn).

Green. Originally O Greenan - Irish / Ua Grianain. A Sept / Family branch, who had their territory in Co. Cavan in Southern Ulster and Co. Sligo in the north - west of the Connacht Province.

Green. French Huguenot origins. Originally Guerin who were in the Athlone area in Co. Westmeath in the south - west of Northern Leinster.

O Greenan or Greene - Irish / Ua Grianain. For  a derivation see Grennan. A Sept / Family branch, who had their territory in Co. Cavan in Southern Ulster and nearby in Co. Sligo in the north - west of the Connacht Province.