Mac Gleen. Used as a variant for Mac Glynn, which see, in the east of the Connacht Province.

Mac Gleenan - Irish / Mheic Giolla Fhinein. A Sept / Family branch, who had their territory in Co. Armagh in the south - east of the Ulster Province. See also - Mac Aleenan.

Gleese / de Glys. They were in the east of Co. Galway in Southern Connacht in the 15th Century AD.

O Gleeson or O Glissane - Irish / Ua Glasain / Ua Gliasain / Ua Glesain. A Sept / Family branch, who had their territory in Co. Kerry in Iar Mhumhain / South Western Munster and were also in Co. Tipperary in Ormond / Aur Mhumhain / North Eastern Munster with the main Sept there in the Heberian Dal gCais kingdom of Lower Ormond, and were kinsmen to the O Donegans, which see - Irish / Ui Donnagain. Glissane used in Co. Kerry.

Glenaghan - Irish / Mag Leannachain. Used as a variant for Mac Clenaghan, which see.

Glendenning. Scottish toponymic origins. They were in Co. Antrim and Co. Tyrone in the Ulster Province after the Confiscation of the 3,500,000 acres of the Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill territories and the non - Catholic Plantations there in the early 17th Century AD.

Mac Glendon or Mac Glindon or Mac Lindon. Variations used for Mac Alinden, which see. Linton was also used as a synonym in Co. Down and nearby in Co. Armagh in the south - east of the Ulster Province.

Mac Glendon. The most important Heremonian Ui Cobhthaigh Dal Cuinn Colla da Crioch Siol Daim Argait (Ui Cremthainn) Muintir Pheodachain / Muintir Feadachain Sept / Family branch, who had their territory in Co. Fermanagh in the south - west of the Ulster Province. Especially see - Mac Alinion.

Glendon or Glindon or Lindon. May be of English origins. They were in Co. Tipperary in the north - east of the Munster Province and nearby in Co. Kilkenny in the south - west of Southern Leinster in the 17th Century AD.

O Glennon. A Sept / Family branch, who had their territory in Co. Roscommon in the east of the Connacht Province.

Mac Glennon - Irish / Mag Leannain - leann / cloak. A Sept / Family branch, who had their territory in the south - west of Northern Leinster in Co. Westmeath, and nearby in Co. Laois and Co. Offaly in the north - west of Southern Leinster.

Mac Glennon - Irish / Ua Gloinin. A Sept / Family branch, who had their territory in Co. Roscommon in the east of the Connacht Province. They may be from the Ui Fiachrach? Ancestor  - *87.Fiachra the original 2nd King of Connacht (Ui Fiachrach), *86.Eochy "Mugmedon" the 124th King of Tara / Ireland ?

Mac Glennon - Irish / Mheic Giolla Fhianain. A Heremonian Ui Cobhthaigh Dal Cuinn Ui Maine Sept / Family branch, who also anglicized as Mac Gillinan. 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.

Mac Glew. 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. Could also be a synonym of Mac Aleavy? Changed to Mac Leod in Co. Dublin in the north - east of Southern Leinster.

Mac Glinchy or Mac Clinchy - Irish / Mag Loingsigh - loingseach / mariner. (Descended from a son of the Mariner) A Sept / Family branch, who had their territory in Co. Donegal, Co. Derry and Co. Tyrone in the Ulster Province. As Mac instead of Mag they anglicized their name as Mac Clinchy, which see.

O Glinn or O Glynn. A Heberian Dal gCais Ui Bloid Sept / Family branch, who had their original territory in Thomond / Northern Munster descended from *93.Brennan / Breanainn "Bran" the direct ancestor of the Muinter Urthaile, the Muinter Maol Domhnaigh and the Muinter Chearnaigh, which were all to also produce the Families of the O Brennans, O Hurleys, O Maglins, O Maegans, O Maloneys and O Muldowneys / Downeys. Ancestors - *93.Brendan / Breanainn "Bran," *92.Blood / Blod (Ui Bloid), *91.Cas the King of Thomond.

Mac Glinn - Irish / Mag Fhloinn. A Sept / Family branch, who had their territory in Co. Roscommon in the east of the Connacht Province and nearby in Co. Westmeath in the south - east of Northern Leinster. See also - Glynn.

Mac Gloin or Mac Glone or Mac Gloon - Irish / Mheic Giolla Eoin (Descended from a son of a devotee of St. John) A Sept / Family branch, who had their territory in Co. Tyrone in Southern Central Ulster and nearby in Co. Donegal in the north - west of the Ulster Province. They were also nearby in Co. Leitrim in Northern Connacht. In Co. Fermanagh and Co. Derry in Ulster along with Mac Aloon it has been also incorrectly changed to Monday due to the sounding of the Irish similar sounding word luain / Monday. Not connected to Mac Glynn.

O Gloirn. A Heberian Dal gCais Sept / Family branch, who had their original territory in Co. Clare in the north - west of Thomond / Tuaisceart Mhumhain / Northern Munster and are now in Co. Kerry in South Western Munster. Ancestors - *104.Cosgrave / Coscrach, *103.Lorcan / Finghin, *102.Lachtna, *101.Corc, *100.Anluan, *99.Mahon, *98.Turlough (Ui Turlough), *97.Cathal, *96.Aodh "Caomh" the King of Munster, *95.Conall, *94.Eochy / Eochaidh "Baill Dearg," *93.Cairthenn "Fionn  Oge Mor," *92.Blood / Blod (Ui Bloid), *91.Cas the King of Thomond.

O Glorney - Irish / Ua Gloiairn. Ua Glothairne now used. A Sept / Family branch, who had their territory in Co. Kilkenny in the south - west of Southern Leinster. Also often confused with Glory.

Mac Glorney. A Heremonian Ui Cobhthaigh Dal Cuinn Colla da Crioch Airthir Ui Echdach Ui Echach Orior Siol Ciarain Ui nEchach Clann Ruadhagain Sept / Family branch, who had their territory in the north of Co. Armagh in the south - east of the Ulster Province and nearby in Co. Down. Especially see - Mac Glory.

Mac Glory or Mac Glorney or Maglory or Mac Glowry or Mac Lavery or Mac Lowry / Mag Labhradha. A Heremonian Ui Cobhthaigh Dal Cuinn Colla da Crioch Airthir Ui Echdach Ui Echach Orior Siol Ciarain Ui nEchach Clann Ruadhagain Sept / Family branch, who had their territory in the north of Co. Armagh in the south - east of the Ulster Province and nearby in Co. Down. Kinsmen to the O Rogan / O Redegan / O Rohagan / O Roogan / O Rodaghan / Ui Ruadhachain, O Donnelly / Ui Domnaill, O Hallahan / O Halligan / O Hollegane / O Holligan. Ancestors - *102.Murrough / Murchad, *101.Rory / Ruaidri, *100.Murrough / Muiredach, *99.Aililla, *98.Cummasach, *97.Echadon, *96.Ruadacan, *95. Kelly / Cellach, *94.Ruadrach, *93.Conmaeil, *92.Airmedach, *91.Feradach, *90.Amalga, *89.Aililla, *88.Echach, *87.Felim / Feidlimid, *86.Fiachrach, *85.Colla "da Crioch" / "Fo Crith "- of the Two Countries, *84.Eochy / Echu "Doimhlen," *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

Glory or Glowery. Also used for Glorney, which see, in Co. Kilkenny in the south - west of Southern Leinster 

O Gloran. A Sept / Family branch, who had their territory in Co. Kilkenny in the south - west of Southern Leinster where they were Chiefs.