O’Reilly – ancient rulers of Co Cavan

O’Reilly is the 11th most common surname in Ireland. The name means ‘extroverted one’ and is derived from the old Irish name O’Raghaillach, which means ‘descendent of Raghaillach’.

Back to Irish surnames

‘Riley’ has become a popular first name for both boys and girls in the United States.

There are also variations of the name such as Riley, Rily, Briley and Brily.

History of the Irish name O'Reilly. Image copyright Ireland Calling In the 15th century the O’Reillys produced their own coins. A ‘Reilly’ is still used as a name for a coin of significant value.

The motto on the O’Reilly coat of arms says ‘Foutitudine et prudentia’ which means ‘With fortitude and prudence’.

Related to the O’Connors

They have close links with the O’Connor kings of Connacht. Both families have a common ancestor in Maolmordha. Maolmordha was the great grandfather of Raghaillach, who was the forefather of the O’Reillys.

The O’Reilly sept once ruled Breffny, which was an ancient Gaelic kingdom which covered the area that is now Co Cavan and parts of the surrounding counties, particularly Co Westmeath.

The first recorded spelling of the name O’Reilly was Cathal O’Reilly who was Prince of Breffny in 1237.

Video of the story of the O’Reilly name

St Mary’s Abbey in Cavan

The O’Reillys were a very religious family and even set up a Franciscan Friary in Cavan, St Mary’s Abbey. It was founded by Giolla Iosa O’Reilly in the early 12th century. It was burned down by the English in 1468 but soon rebuilt by the Irish. It was an active friary until 1826.

All that remains of the abbey today are the three story tower, the graveyard and a section of the wall. Myles “the slasher” O’Reilly, who was a hero in the Battle of the Bridge of Finea in 1644 is buried in the graveyard, as is 1640 Rebellion leader, Eoghan Roe O Neill.

Thirty nine abbots who worked at St Mary’s were O’Reillys. The family has also produced Archbishops in Co Armagh.

Military O’Reillys

John Boyle O’Reilly was born in Co Louth 1844. He became involved in Fenian military groups and was deported to Australia. He escaped and headed to America where he settled in Boston and became editor of the Pilot newspaper. Before long the Pilot became one of the most read publications in the entire country.

John Rielly was leader of the San Patricios, who were a group of Irish Americans who deserted the US Army during the 1846-48 Mexican war and went to fight for the Mexicans.

They were unhappy with the way Irish American Catholics were treated by the rest of the US Army and also disagreed with brutality towards Mexican citizens, priests and nuns. Today there is a sculpture of John Reilly as well as the flag of the San Patricios in his home town of Clifden, Co Galway.John C Reilly. Photo copyright Asim Bharwani CC3

Famous O’Reillys throughout the world

James F. Reilly was an astronaut born in 1954 in Idaho. Throughout his career he spent over 850 hours in space which included five spacewalks.

Paddy Reilly was a folk singer born in Dublin in 1939. He had several years of success as a solo performer in Europe the US and Australia before joining the Dubliners as replacement for Ronnie Drew.

His namesake was a coach driver who became the subject of the famous Percy French song, Come Back Paddy Reilly to Ballyjamesduff.

Hollywood actor John C. Reilly has appeared in several hit movies including Gangs of New York, The Hours and Step Brothers. He was nominated for an Oscar for Best Supporting Actor for his performance in Chicago.

Back to Irish surnames

Great Celtic art available in our store - Personalised prints

Your name in Ogham. Personalised artwork

Loads more products and designs available

Do you qualify to become an Irish citizen?

There are three main ways for a person to qualify for Irish citizenship – through birth, through marriage or civil partnership or through naturalisation. Check if you qualify for Irish citizenship

Did you know?

Singing Cork barman has fans across the world - a video of the Irish music loving barman singing while he poured a pint went viral as people became enchanted by his easy going style and great voice. Check out his video.

Have you heard about…

Irish people warned about the ‘Celtic curse’ - a potentially deadly blood condition, that harms the liver, heart and pancreas, has been labelled the ‘Celtic Curse’ because more people in Ireland are prone to it than people from other countries. Find out more.

What about this…

‘Irish giant’ Tom Crean was one of the bravest and toughest explorers of the early part of the 20th century. Thanks to his positivity and faith, he managed to not only survive horrific conditions but also save the lives of his colleagues. Find out more.
Copy Protected by Chetan's WP-Copyprotect.