O Heaphy - Irish / Ua hEamthaigh. A Sept / Family branch, who had their territory in Co. Waterford in the south - east of the Munster Province.

O Hear. Used as a variant by a Sept / Family branch of the O Hares, which see, who had their territory in Co. Tyrone in Central Ulster.

Hearne. An English name used in Co. Waterford in the south - east of the Munster Province as a variant for Aherne - Irish / Ua hEachthighearna / Ua hEachthighearna, which Especially see. A Heberian Dal gCais Sept / Family branch - who had their original territory in Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster. Ancestors - 105.Ahern / Eachthighearn, *104.Kennedy / Ceaneidigh, *103.Lorcan, *102.Lachtna, *101.Corc, *100.Anluan, *99.Mahon, *98.Turlough / Toirdhealbhach (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 (Dal gCais) the King of Thomond.

O Hearty - Irish / Ua hAghartaigh. A Heremonian Ui Cobhthaigh Dal Cuinn Sept / Family branch, who had their territory in the 3 Colla kingdom of Orghialla / Oriel in Co. Louth in the north - east of Northern Leinster and the adjacent Co. Monaghan in Southern Ulster. No connection to Harty. Ancestor - *80.Conn of the Hundred Battles the 110th King of Tara / Ireland. (Dal Cuinn).

O Heary or O Heery - Irish / Ua hIoruaidh. A Sept / Family branch, who had their territory in Co. Meath in the south - east of Northern Leinster and the adjacent territory in Co. Cavan in Southern Ulster. In the 14th Century AD they were known as O Hyry. In the 16th Century AD they were known as O Herrye.

Heaslip or Haslip or Hyslop (Dweller in the hazel valley) English origins. 6 variants recorded. In the 17th Century AD they were in the Munster Province and are now also in Co. Cavan in Southern Ulster.

Heath. English locative origins. They have been in Co. Dublin in the north - east of Southern Leinster since 1589 AD.

Heatley. English toponymic origins. They were in Co. Dublin in the north - east of Southern Leinster in the Mid - 17th Century AD and are now mainly in Co. Antrim in the north - east of the Ulster Province and Co. Armagh in the south - east of Ulster.

Heaton. English toponymic origins. They were in Co. Offaly in the north - west of Southern Leinster in the Mid - 17th Century AD and are now in the Ulster Province.

O Heaven - Irish / Ua hEimhin - eimhidh / swift. A Sept / Family branch, who had their territory in Co. Offaly in the north - west of Southern Leinster. Some changed to Evans elsewhere.

O Heavy - Irish / Ua hEamhaigh. Cognate with Heaphy. In all Provinces, but rare in the Ulster Province. A Sept / Family / branch, who had their main territory in Athlone in Co. Westmeath in the south - west of Northern Leinster.

O Hea - Irish / Ua hAedha. A Heremonian Ui Cobhthaigh Dal Cuinn Colla Uais Ui Mheic Uais Ui Fiachrach Arda Sratha Sept / Family branch, who had their territory at Ardstraw in Co. Tyrone in Central Ulster. Kinsmen to O Crehan / O Creighton / Ui Criochain. Ancestors - *96.Crichain, *95.Cathassach, *94.Mael "Cothaig," *93.Guaire, *92.Forannan, *91.Ainmerech, *90.Cormac, 89.Dougherty / Dochartach, *88.Fiachach, *87.Erc, *86.Eochy / Eachach, *85.Carroll / Carioll "Colla "Uais" the 121st King of Tara / Ireland, *84.Eochy / Echu "Doimhlen," *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

Hector. Gaelic / hEachtair -

O Hedderman or O Hederman or O Hetherman or O Heatherman - Irish / Ua hEadromain - eadtrom / light / fickle. A Sept / Family branch, who had their territory in the west of Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster. They were connected to St. Senan of Inis Cathaig (Scattery Island) and the River Shannon estuary and were also nearby in Co. Limerick, and in the east of Co. Cork in Southern Munster.

O Hedian or O Hadian - Irish / Ua hEidin. A Sept / Family branch, who had their territory in Co. Roscommon and the adjacent territory in Co. Leitrim in the north of the Connacht Province. Sometimes confused with O Hayden as their name was derived from a similar source, but both Septs are distinct.

O Hedigan or O Hadigan - Irish / Ua hEideagain. A Sept / Family branch, who had their territory in Co. Roscommon and the adjacent territory in Co. Leitrim in the north of the Connacht Province. Now also in the west of Co. Clare in the north - west of the Munster Province, Cognate with Mac Gettigan.

O Hedivan or O Heduvan or O Hednan - Irish / Ua hEadamhain. A Sept / Family branch, who had their territory in Co. Westmeath in the south - west of Northern Leinster.

O Heelan. Used as a variant for Hyland, which see, in the Munster Province.

O Heenan - Irish / Ua hEanain. A Sept / Family branch, who had their territory at Roscrea on the border of Co. Tipperary in the north - east of Ormond / Aur Mhumhain / North Eastern Munster and the adjacent territory in Co. Offaly in the north - west of Southern Leinster.

O Heenan - Irish / Ua hEanain. A Sept / Family branch, who had their territory in Co. Down in the south - east of the Ulster Province.

O Heerin - Irish / Ua hUidhrin. A Sept / Family branch, who had their territory in Co. Offaly in the north - west of Southern Leinster. Anglicized originally as O Heryne and O Heverine. O Heffron used as a synonym also creating confusion with O Heffernan.