Old Irish Origin Surnames

This is a list of surnames in which the origin is Old Irish. Old Irish was the form of the Irish language spoken up to the 10th century.

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Ó Flannagáin Irish
Irish Gaelic form of Flanagan.

Ó Floinn Irish
Irish Gaelic form of Flynn.

Ó Frighil Irish
Irish Gaelic form of Friel.

Ó Gallchobhair Irish
Irish Gaelic form of Gallagher.

Ó hAodha Irish
Irish Gaelic form of Hayes 2.

Ó hAonghuis Irish
Irish Gaelic form of Hennessy.

Ó hEachthighearna Irish
Means "descendant of Echthigern" in Irish.

O'Hearn Irish
Anglicized form of Ó hEachthighearna.

O'Kane Irish
Anglicized form of Ó Catháin.

O'Keefe Irish
Variant of Keefe.

Ó Mainnín Irish
Irish Gaelic form of Manning 2.

Ó Maoil Eoin Irish
Irish Gaelic form of Malone.

Ó Maoil Riain Irish
Means "descendant of a follower of Rian", derived from Irish maol meaning "follower".

Ó Maoilsheachlainn Irish
Means "descendant of Maolsheachlann" in Irish.

Ó Maol Aodha Irish
Means "descendant of a follower of Saint Aodh". It is derived from Irish maol meaning "follower, servant".

Ó Maol Bhréanáin Irish
Means "descendant of a follower of Saint Brendan" in Irish.

Ó Mathghamhna Irish
Irish Gaelic form of Mahoney.

Ó Muircheartach Irish
Irish Gaelic form of Moriarty.

Ó Muireadhaigh Irish
Irish Gaelic form of Murray 2.

Ó Murchadha Irish
Irish Gaelic form of Murphy.

O'Neal Irish
From Irish Ó Néill meaning "descendant of Neil".

O'Neill Irish
Variant of O'Neal.

Ó Néill Irish
Irish Gaelic form of O'Neal.

O'Niall Irish
Variant of O'Neal.

Ó Riagáin Irish
Irish Gaelic form of Reagan.

Ó Riain Irish
Means "descendant of Rian".

Ó Ríoghbhárdáin Irish
Irish Gaelic form of Riordan.

Orman Irish
Anglicized form of Ó Ruaidh.

Ormond Irish
Anglicized form of Ó Ruaidh.

Ormonde Irish
Anglicized form of Ó Ruaidh.

Ó Ruadháin Irish
Means "descendant of Ruadhán" in Irish.

Ó Ruaidh Irish
Means "descendant of Ruadh" in Irish.

Ó Séaghdha Irish
Means "descendant of Séaghdha".

Ó Seanáin Irish
Irish Gaelic form of Shannon.

O'Shea Irish
Anglicized form of Ó Séaghdha.

Ó Taidhg Irish
Irish Gaelic form of Teague 1.

Ó Tíghearnaigh Irish
Irish Gaelic form of Tierney.

O'Toole Irish
Anglicized form of Irish Ó Tuathail meaning "descendant of Túathal".

Ó Treasaigh Irish
Irish Gaelic form of Tracey 2.

Ó Tuathail Irish
Irish Gaelic form of O'Toole.

Quinlan Irish
From Irish Ó Caoindealbháin, which means "descendant of Caoindealbhán", a given name meaning "handsome form" (using a diminutive suffix).

Quinn Irish
Anglicized form of Irish Ó Cuinn meaning "descendant of Conn".

Reagan Irish
Anglicized form of Irish Ó Riagáin meaning "descendant of Riagán". A famous bearer was the American president Ronald Reagan (1911-2004).

Reardon Irish
Variant of Riordan.

Regan Irish
Variant of Reagan.

Riordan Irish
From Irish Ó Ríoghbhárdáin meaning "descendant of Rígbarddán".

Rowan Irish
Anglicized form of Ó Ruadháin.

Ruane Irish
Anglicized form of Ó Ruadháin.

Ryan Irish
Anglicized form of Ó Riain, or else a simplified form of Mulryan.

Shannon Irish
From Irish Ó Seanáin meaning "descendant of Seanán".

Shaw 2 Scottish
From a given name or byname that was derived from Gaelic sitheach meaning "wolf" (Old Irish sídach).

Shea Irish
Anglicized form of Ó Séaghdha.

Sheach Scottish
Variant of Shaw 2.

Sheehy Irish
Variant of McSheehy.

Sheenan Irish
Variant of Shannon.

Slane Irish
Originally indicated a person from Slane, County Meath, Ireland, which is derived from the given name Sláine.

Sweeney Irish
Anglicized form of Mac Suibhne.

Teague 1 Irish
Anglicized form of Irish Ó Taidhg meaning "descendant of Tadhg".

Tierney Irish
From Irish Ó Tíghearnaigh meaning "descendant of Tighearnach".

Tighe Irish
Anglicized form of Ó Taidhg.

Toole Irish
Variant of O'Toole.

Tracey 2 Irish
Anglicized form of Irish Ó Treasaigh meaning "descendant of Treasach".

Tracy English, Irish
Variant of Tracey 1 or Tracey 2.

Treacy Irish
Variant of Tracey 2.

Whalen Irish
Variant of Whelan.

Whelan Irish
Anglicized form of Irish Ó Faoláin meaning "descendant of Faolán".