O Hayden or O Headon - Irish / Ua hEideain. A Sept / Family branch, who had their territory in Co. Carlow in the south of Southern Leinster. Sometimes anglicized as O Headon, which see. See also O Hedian.

O Hayden or O Haide or O Hayde - Irish / Ua hEidhin. A Sept / Family branch, who had their territory in Co. Galway in Southern Connacht.

Hayes / Hughes - Irish / Ua h Aodha / fire. Many Septs / Family branches in the Munster Province, in Co. Donegal in the north - west of the Ulster Province, and in Co. Monaghan and Co. Tyrone in Southern Ulster, Co. Mayo in the mid - west of the Connacht Province, Co. Meath in the south - east of Northern Leinster, See also O Hea.

Hayes / de la Haye / Le Heise. Anglo Norman origins. They were in Co. Wexford in the south - east of Southern Leinster. See also Hay.

Hayles or Hale. Both English and Scottish origins. They have been in Co. Cork in Southern Munster since the 17th Century AD. Also used as a synonym for Healy and Mac Hale, which see.

Hazelton or Hazelwood. May have been used by the Irish / Mheic Conchollchoille to anglicize their name?

Haynes. English origins. Used for Hynes, which see, in the Munster Province.

Hazelton. English toponymic origins. They were in Co. Armagh in the south - east of the Ulster Province. Haselden used as a synonym nearby in Co. Down also in the south - east of Ulster.

Hazlett or Heslitt or Heazley - locative / hazel copse. 12 variations used, all in the Ulster Province, especially in Co. Monaghan in Southern Ulster since the Mid - 18th Century AD.

O Hea - Irish / Ua hAodha. An  Ithian Corca Laoidhe Sept / Family branch, who had their territory and were Chiefs in Co. Cork in Desmond / Des Mhumhain / Southern Munster. They were Chiefs also of the Muscry Luachra territory between Kilmallock and Ardpatrick in the Barony of Coshlea in Co. Limerick in the mid - north - west of Thomond / Northern Munster. A few may have also anglicized as Hayes. Ancestors - *36.Lewy / Lughaidh, *35.Ith (Ithians).

O Hea - Irish / Ua hAodha. A Sept / Family branch, who had their territory and were Chiefs in Co. Meath in the south - east of Northern Leinster. Some may have also anglicized as Hayes.

O Hea - Irish / Ui 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.Doherty / Dochartach, *88.Fiachach, *87.Erc, *86.Eochy / Eachach, *85.Carrol / Carioll "Colla Uais" the 121st King of Tara / Ireland, *84.Eochy / Echu "Doimhlen," *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland. 

Head or Heade (Dweller at the head of a valley or stream) English locative origins. They were in Co. Meath in the south - east of Northern Leinster and Co. Tipperary in the mid - north - west of the Munster Province in 1659 AD and were also in Co. Waterford and Co. Cork in the east of Munster. As Catholics they were transplanted after the Oliver Cromwell Invasion across the River Shannon to the east of Co. Galway in Southern Connacht.

Headon. Norman origins. They were in Co. Wexford in the south - east of Southern Leinster. See also Hayden.

Heague. See - Mac Teige - Irish / Mheic Thaidhg in the Connacht Province.

O Healy or O Hely - Irish / Ua hEilidhe / claimant, A Sept / Family branch, who had their territory at Ballyhely on Loch Arrow in Co. Sligo in the north - west of the Connacht Province.

O Healy or O Healihy or O Hely - Irish / Ua hEaladaighthe. A Sept / Family branch, who had their territory at Muskerry / Donoughmore in Co. Cork in Desmond / Des Mhumhain / Southern Munster. One of the ain Septs turned non - Catholic to try and hold on to their territory there.

O Heaney or O Heeney - Irish / Ua hEighnigh or Ua hEicnig. An Erenagh Sept / Family branch, who had their territory at Banagher in Co. Derry in the north - east of the Ulster Province.

O Heaney - Irish / Ua hEanna / Enda. A Sept / Family branch, who had their territory in Co. Clare and Co. Limerick in Thomond / Tuaisceart Mhumhain / Northern Munster.

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

O Heanue - Irish / Ua hEanadha. A Sept / Family branch, who had their territory in the Connemara in Co. Galway in the south - west of the Connacht Province. May have been a Sept of the O Heaneys in Co. Mayo?