O Harrily - Irish / Ua hEarghaile. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province where many have changed to Harley.

O Harrily - Irish / Ua Earghaile. A Sept / Family branch, who had their territory in Co. Mayo in the mid - west of the Connacht Province.

Harrington. English toponymic origins. Originally anglicized as O Hingerdell - Irish / Ua hlongardail. A Sept / Family branch, who had their territory in Co. Cork and Co. Kerry in Desmond / Des Mhumhain / Southern Munster.

Harrington. Originally anglicized as O Harraughton - Irish / Ua hArrachtain. A Sept / Family branch, who had their territory in Co. Kerry and Co. Cork in Desmond / Des Mhumhain / Southern Munster and Co. Galway in Southern Connacht.

Fitz Harris. They were in Co. Wexford in the south - east of Southern Leinster and Co. Limerick in the mid - north - west of the Munster Province.

Harrson -

O Hart - Irish / Ui hAirt. A Heremonian Ui Cobhthaigh Dal Cuinn 3 Colla da Crioch Sept / Family branch descended from *85. Murray / Muireadach "Colla da Chrioch" who had their territory initially in Co. Meath in the south - east of Northern Leinster. They were part of the "Four Tribes of Tara" and were pushed westwards by the Anglo Normans into Co. Sligo in the north - west of the Connacht Province where they were Chiefs. Ancestors - *85.Colla "da Crioch / Focrith" - of the Two Countries, *84.Eochy / Echu "Doimhlen, " *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

O Hartigan - Irish / O hArtagain. A Heberian Dal gCais Sept / Family branch,  who had their territory in the east of Co. Clare and nearby in the north of Co. Limerick in the north - west of Thomond / Tuaiscert Mhumhain / Northern Eastern Munster. They were also in Co. Cork in Desmond / Des Mhumhain / Southern Munster. Ancestor - *91.Cas (Dal gCais) the King of Thomond.

O Hartily or O Hartley. English names used by the Irish / Ui hArtghaile - Art / gal - valour. A Sept / Family branch, who had their territory in Co. Wexford in the south - east of Southern Leinster.

O Hartin - Irish / Ua hArtain. A Sept / Family branch, who had their territory in Co. Longford in the north - west of Northern Leinster and were also nearby in the west of the Ulster Province. Harton an English name was also used as a variant.

O Hartnane, or O Hernan, which see - Irish / Ua hEarnain / earna - experienced. Also used as a synonym for Heffernan, which see, in Co. Kerry in the south - west of the Munster Province. See also Hernon.

O Hartnett or O Harnet - Irish / Ui hAirtneada. A Sept / Family branch, who had their territory in the west of Co. Cork in Desmond / Des Mhumhain / Southern Munster. Hartnett used mostly in Co. Limerick. Harnedy was used as a variant.

O Hartry - Irish / Ua hAirtri. A Sept / Family branch,- who had their territory in the Connacht Province and are now in Co. Waterford in the south - east of the Munster Province and in the south of Co. Tipperary in the north - east of Thomond / Tuaiscert Mhumhain / Northern Munster. Harty was also used as a variant.

O Harty - Irish / Ua hAthartaigh / Ua hArtaigh / faghartach - noisy. A Sept / Family branch, who had their territory in Co. Tipperary in Thomond / Tuaiscert Mhumhain / Northern Munster and adjacent territory in Co. Cork in Desmond / Des Mhumhain / Southern  Munster. They were also in Co. Laois in the mid - north - west of Southern Leinster. Also see Hearty.

Harvey - Irish / Ua hAirmheadhaigh / airmed? (a measure of grain). A Sept / Family branch, who had their territory in the south of Co. Galway in Southern Connacht.

Harvey. English origins. They were in the Ulster Province and also in Co. Wexford in the south - east of Southern Leinster. Bargy Castle was the home of Bagenal Harvey and is north - west of Loch Tacumshane in Co. Wexford in the south - east of Southern Leinster.

Harwood. English toponymic origins. They were in the Munster Province. In the Ulster Province it was changed to Harrot and Hart. Gaelicized also as Harold / Haroid.