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

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

Hayes / Hughes / Irish - Ui h Aodha - fire / Many Septs - Family branches in Munster, Co. Donegal - North West Ulster, Co. Mayo - Mid Western Connacht, Co. Meath - North East Leinster, Co. Monaghan & Co. Tyrone - Ulster / See also O Hea.

Hayes / de la Haye / Le Heise / Anglo Norman origins / They were in Co. Wexford - South East Leinster / See also Hay.

Hayles or Hale / Both English & Scottish origins / / They were in Co. Cork - Southern Munster since the 17th Century / Also used as a synonym for Healy & 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 Munster.

Hazelton / English toponymic origins / They were in Co. Armagh - South East Ulster / Haselden used as a synonym in Co. Down - South East Ulster.

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

O Hea / Irish - Ui hAodha / A Sept - Family branch of the Ithian Corca Laoidhe Tuatha - Family region who were Chiefs in Co. Cork - Southern Munster / Chiefs also of the Muscry Luachra territory between Kilmallock & Ardpatrick in the Barony of Coshlea in Co. Limerick - North West Munster / A few may have also anglicized as Hayes. *35.Ith.

O Hea / Irish - Ui hAodha / A Sept - Family branch who had their territory and were Chiefs in Co. Meath - North East Leinster / Some may have also anglicized as Hayes.

Head or Heade / dweller at the head of a valley or stream / English locative origins / They were in Co. Meath - North East Leinster & Co. Tipperary - Northern Munster in 1659 and were also in Co. Waterford & Co. Cork - East Munster / As Catholics they were transplanted by Cromwell across the River Shannon to the east of Co. Galway - Southern Connacht.

Headon / Norman origins / They were in Co. Wexford - South East Leinster / See also Hayden.

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

O Healy or Hely / Irish - Ui hEilidhe - claimant / A Sept - Family branch who had their territory at Ballyhely on Loch Arrow in Co. Sligo - North West Connacht.

O Healy or Healihy or Hely / Irish - Ui hEaladaighthe / A Sept - Family branch who had their territory at Muskerry - Donoughmore in Co. Cork - Southern Munster / They turned Protestant to try and hold on to their territory there.

O Heaney or Heeney or Mac Anenay / Irish - Ui hEighnigh or Ui hEicnig / A Sept - Family branch from the 3 Colla kingdom of Airgialla - Oriel in Co. Armagh, Co. Monaghan then into Co. Fermanagh - South West Ulster were they were Kings and Chiefs / Hegney was used as a variant / See also Bird. *84.Echu "Doimlen."

O Heaney or Heeney / Irish - Ui hEighnigh or Ui hEicnig / An Erenagh Sept - Family branch who had their territory at Banagher in Co. Derry - North East Ulster.

O Heaney / Irish - Ui hEanna - Enda / A Sept - Family branch who had their territory in Co. Clare & Co. Limerick - North West Munster.

O Heaney / Irish - Ui hEanna - Enda / A Sept - Family branch who had their territory in Co. Mayo - Mid Western Connacht.

O Heanue / Irish - Ui hEanadha / A Sept - Family branch who had their territory in the Connemara in Co. Galway - South Western Connacht / May have been a Sept of the Heaneys in Co. Mayo?