Several Scottish families may descend from an O'Neill dynast named Anradhán.
According to Leabhar Chlainne Suibhne, Anradhán, son of Aodh Athlamháin, quarrelled with his elder brother, Domhnall, ancestor of the O'Neills, and left Ireland for Scotland.
This source states that Anradhán won extensive lands by conquest, and married the daughter of the King of Scots.
Anradhán, who does not appear in contemporary sources, was apparently an 11th-century dynast, son of Aodh Athlamháin, King of Aileach (died 1033).
Although Leabhar Chlainne Suibhne states that Anradhán gained his lands through conflict, it is possible that he secured these lands in Argyll through marriage to their heiress.
Leabhar Chlainne Suibhne, Dubhaltach Mac Fhirbhisigh's genealogies, and Cú Choigcríche Ó Cléirigh's pedigrees specifically state that the MacSweens were descended from Anradhán.
According to Mac Fhirbhisigh's genealogies, Ó Cléirigh's pedigrees, and MS 1467, the Lamonts were also descendants.
MacLachlans were also descendants, according to Ó Cléirigh's pedigrees and MS 1467.
According to MS 1467, the MacSorleys of Monydrain, ([of Clan MacDonald of Dunnyveg a branch of Clan Donald) and MacEwens of Otter are also descendants.
The Gilchrists appear to be another family descended from Anradhán.
The original Gaelic surname of the Highland Livingstones suggests that they were also descendants.
There is uncertainty regarding the ancestry of the MacNeills.
The family of Barra may well be unrelated to the family of Taynish and Gigha.
It is uncertain if either family descended from Anradhán, although tradition dating to the turn of the twentieth century suggests that the Barra family may have.

Siol Alpin as noted above the Uí Neill Dynasty are descended from Siol Alpin
Clan Bruce Clan claim descent from the Connachta's Uí Briúin.

Clan Cumming Clan related to the Uí Néill.

Clan Donald Claims to be traced back to through a long line of ancestors back to the High Kings of Ireland, namely Colla Uais and Conn of the Hundred Battles to Cairbre Lifechair a commons ancestor of the Uí Néill and the Connachta
Clan MacLean intermarried with the Ui Neill.

Clan Macqueen alleged to be of same descent as Clan Donald.

Clan MacSweeney-as noted above claim descent from Uí Néill.

Ó Brádaigh-sept of the O'Brian clan.

O'Carroll clan -related to the Ui Neill.

O'Cahan - claim descent from the Uí Néill.

Clan Ó Ceallaigh-related to the Uí Néill.

Clann Cholmáin claim descent from the Southern Uí Néill.

Ó Coileáin  related to the Uí Néill.

Ó Conchubhair claim descent from the Connachta's Uí Briúin.

Ó Conghalaigh intermarried with the Uí Néill.

Ó Dálaigh Clan claim descent from a son of Niall of the Nine Hostages.

Dempsey Clan intermarried with the O'Nell
O'Devlin clan claim descent from Uí Néill.

O'Doherty clan claim descent from Uí Néill.

O'Donnell dynasty Clan claim descent from Uí Néill.

O'Donnelly Clan claim descent from Uí Néill.

FitzGeralds intermarried with the Uí Néill.

O'Gallagher Clan claim descent from Uí Néill.

Gavigan Clan claim descent from the Southern Uí Néill.

O'Gorman Clan intermarried with the Uí Néill.

O'Grady Clan are distant cousions of the O'Brian Clan.

O'Higgins family claim descent from the Southern Uí Néill.

Ó Flaithbheartaigh Clan claim descent from the Connachta's Uí Briúin.

Kavanagh Clan claim descent from the Connachta's Uí Briúin.

Mac Brádaigh Clan.
They claim descent from High King of Ireland Eochaid Mugmedon.

McGuinness Clan intermarried with the O'Neill Clan
Maguire Clan related to the Uí Néill.

O'Murphy Clan claim descent from the Northern Uí Néill
O'Reilly Clan.
 The clan were part of the Connachta's Uí Briúin Bréifne kindred and were closely related to the Ó Ruairc (O'Rourkes) of West Bréifne.

O'Rourke Clan.
They claim descent from High King of Ireland Eochaid Mugmedon through his son Brión (whence the Uí Briúin), the half-brother of High King Niall of the Nine Hostages, the acclaimed ancestor of the Uí Néill.

O'Toole Clan intermarried with the Uí Néill.
Several Scottish families may descend from an O'Neill dynast named Anradhán. According to Leabhar Chlainne Suibhne, Anradhán, son of Aodh Athlamháin, quarrelled with his elder brother, Domhnall, ancestor of the O'Neills, and left Ireland for Scotland. This source states that Anradhán won extensive lands by conquest, and married the daughter of the King of Scots. Anradhán, who does not appear in contemporary sources, was apparently an 11th-century dynast, son of Aodh Athlamháin, King of Aileach (died 1033). Although Leabhar Chlainne Suibhne states that Anradhán gained his lands through conflict, it is possible that he secured these lands in Argyll through marriage to their heiress. Leabhar Chlainne Suibhne, Dubhaltach Mac Fhirbhisigh's genealogies, and Cú Choigcríche Ó Cléirigh's pedigrees specifically state that the MacSweens were descended from Anradhán. According to Mac Fhirbhisigh's genealogies, Ó Cléirigh's pedigrees, and MS 1467, the Lamonts were also descendants. MacLachlans were also descendants, according to Ó Cléirigh's pedigrees and MS 1467. According to MS 1467, the MacSorleys of Monydrain, ([of Clan MacDonald of Dunnyveg a branch of Clan Donald) and MacEwens of Otter are also descendants. The Gilchrists appear to be another family descended from Anradhán. The original Gaelic surname of the Highland Livingstones suggests that they were also descendants. There is uncertainty regarding the ancestry of the MacNeills. The family of Barra may well be unrelated to the family of Taynish and Gigha. It is uncertain if either family descended from Anradhán, although tradition dating to the turn of the twentieth century suggests that the Barra family may have.
Siol Alpin as noted above the Uí Neill Dynasty are descended from Siol Alpin
Clan Bruce Clan claim descent from the Connachta's Uí Briúin.
Clan Cumming Clan related to the Uí Néill.
Clan Donald Claims to be traced back to through a long line of ancestors back to the High Kings of Ireland, namely Colla Uais and Conn of the Hundred Battles to Cairbre Lifechair a commons ancestor of the Uí Néill and the Connachta
Clan MacLean intermarried with the Ui Neill.
Clan Macqueen alleged to be of same descent as Clan Donald.
Clan MacSweeney-as noted above claim descent from Uí Néill.
Ó Brádaigh-sept of the O'Brian clan.
O'Carroll clan -related to the Ui Neill.
O'Cahan - claim descent from the Uí Néill.
Clan Ó Ceallaigh-related to the Uí Néill.
Clann Cholmáin claim descent from the Southern Uí Néill.
Ó Coileáin  related to the Uí Néill.
Ó Conchubhair claim descent from the Connachta's Uí Briúin.
Ó Conghalaigh intermarried with the Uí Néill.
Ó Dálaigh Clan claim descent from a son of Niall of the Nine Hostages.
Dempsey Clan intermarried with the O'Nell
O'Devlin clan claim descent from Uí Néill.
O'Doherty clan claim descent from Uí Néill.
O'Donnell dynasty Clan claim descent from Uí Néill.
O'Donnelly Clan claim descent from Uí Néill.
FitzGeralds intermarried with the Uí Néill.
O'Gallagher Clan claim descent from Uí Néill.
Gavigan Clan claim descent from the Southern Uí Néill.
O'Gorman Clan intermarried with the Uí Néill.
O'Grady Clan are distant cousions of the O'Brian Clan.
O'Higgins family claim descent from the Southern Uí Néill.
Ó Flaithbheartaigh Clan claim descent from the Connachta's Uí Briúin.
Kavanagh Clan claim descent from the Connachta's Uí Briúin.
Mac Brádaigh Clan. They claim descent from High King of Ireland Eochaid Mugmedon.
McGuinness Clan intermarried with the O'Neill Clan
Maguire Clan related to the Uí Néill.
O'Murphy Clan claim descent from the Northern Uí Néill
O'Reilly Clan.  The clan were part of the Connachta's Uí Briúin Bréifne kindred and were closely related to the Ó Ruairc (O'Rourkes) of West Bréifne.
O'Rourke Clan. They claim descent from High King of Ireland Eochaid Mugmedon through his son Brión (whence the Uí Briúin), the half-brother of High King Niall of the Nine Hostages, the acclaimed ancestor of the Uí Néill.
O'Toole Clan intermarried with the Uí Néill.
O'Neill dynasty