O Hilan. Used as a variant for O Hyland, which see, in Co. Kilkenny and Co. Kildare in Southern Leinster and for O Filan in Co. Westmeath in the south - west of Northern Leinster.

O Hilferty or O Halferty or O Helverty / Irish / Ua hAilbheartaigh - ilbeartach / accomplished. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province.

Hill, English name. They were in Co. Antrim in the north - east of the Ulster Province.

Hill. Gaelic / an Chnuic (of the hill - locative name). They were in Co. Kerry in the south - west of the Munster Province. See also Glanny.

Hillan or Hilland or Hillen. English origins. They were in the Ulster Province.

Hillas or Hillis. Originally Hillhouse. Hillis mainly used in the Ulster Province, and Hillas in Co. Sligo in the north - west of the Connacht Province since the Mid - 18^th Century AD.

Hilliard. German English origins. They came from Yorkshire to Ireland in the 17^th Century AD and are now in Co. Kerry in the south - west of the Munster Province.

O Hilly or O Hillee - Irish / Ua hItcheallaigh. Used as a variant for O Fihelly, which see, in the north of Co. Kerry in the south - west of the Munster Province.

Hilton. English toponymic origins. They were in Co. Dublin in the north - east of Southern Leinster in the 16^th Century AD, but most arrived later with the Confiscation of the 3,500,000 acres of the Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill territories in the Ulster Province and the non - Catholic Plantations there after 1609 AD and were also in Ulster.

O Hiney or Hynie - Irish / Ua hEidhnigh / Ua hAdnaigh - adnadh / courage. A Sept / Family branch, who had their territory in Co. Galway in Southern Connacht  and were also nearby in Northern Leinster.

O Hingerty - Irish / Ua hIongardail. See Harrington.

Hipwell. English toponymic origins. They have been in Co. Laois in the mid - north - west of Southern Leinster since the Mid - 17^th Century AD.

O Hirrell or O Hirl / Irish - Ua Irghil. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province. Similar to O Friel. See also - Harold.

O Hishon. Used for O Hession, which see, in Co. Tipperary in the north - east of the Munster Province.

O Hiskey - Irish / hUisce originally O Horish - Irish / Ui hUarghuis. Later anglicized as Waters, which see.

O Hoban - Irish / Ua hUbain. A Heremonian Ui Cobhthaigh Dal Cuinn Cenel nEogain "Northern" Ui Niaill Sept / Family branch, who had their territory in Co. Mayo in the mid - west of the Connacht Province. Later they were in Co. Kilkenny in the south - west of Southern Leinster in the 17^th Century AD. Ancestors - *88.Eogan the 1st King of Aileach (Cenel nEogain), *86.Niall of the Nine Hostages the 126th King of Tara / Ireland (Ui Niall).