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O'Reilly Coat of Arms / O'Reilly Family Crest

O'Reilly Coat of Arms / O'Reilly Family Crest

O'Reilly Family Crest / O'Reilly Coat of Arms


Please be aware that there is more than one o'reilly coat of arms. If you would like this particular coat of arms, you must describe it on your order form. If you don't describe it on your order form, we will provide you with the oldest coat of arms on record for this surname, which may or may not be the one pictured above.

Also, the heraldry images on this website are copyrighted. Please email me if you would like permission to use the image pictured above on a website.

Gaelic: Raghallaigh

The Irish surname O'Reilly is among the 10 most frequently found in Ireland, and is derived primarily from the Gaelic O'Raghallaigh Septs of Counties Cavan and Westmeath. It is in these Counties and the Province of Leinster that most of the descendants can still be found.

O'Reilly, in Irish O Raghailligh, I.e descendant of Raghallach, was until recently much more commonly found without the prefix O. Reilly and O'Reilly constitute one of the most numerous names in Ireland, being among the first dozed in the list. The bulk of these come from Cavan and adjoining counties, the area to which they belong by origin, for they were for centuries the most powerful sept in Breffny, their head being chief of Breffny-O'Reilly and for a long time in the middle ages his influence extended well into Meath and Westmeath. At the present time we find them very numerous still in Breffny, heading as they do the county list both in Cavan and Longford. In 1878 O'Reilly landlords possessed over 30,000 acres. five O'Reillys have held the Primacy as Archbishop of Armagh, notably Edmund O'Reilly (1606-1669) and Hugh O'Reilly (1580-1653); five were Bishops of Kilmore, tow of Clogher and one of Derry; and another famous churchman was Edmund Joseph O'Reilly, S.J. (1811-1878). Edward O'Reilly (d. 1829) compiled a pioneer Irish-English Dictionary in 1817. In the field of patriotic endeavour we have John Boyle O'Reilly (1844-1890) the Fenian; Myles O'Reilly M.P. (1825-1880) who commanded the Irish Brigade in the Papal service; and Philip MacHugh O'Reilly (d. 1657), who, having been largely responsible for organizing the rising of 1641 in his own county of Cavan, fought under Owen Roe O'Neill and died in exile. In King James III's Irish army Col. Edmund O'Reilly's regiment of infantry included thirty-three officers and Co. Mahon's regiment sixteen officers called Reilly or O'Reilly. Many of these became Wild Geese. Count Don Alexander O'Reilly (d. 1797), after a distinguished military career in the French, Austrian and Spanish service ended his days as Governor of Louisana in America. A good deal of unreliable material is to be found in print on the subject of the O'Reillys. It is therefore advisable to mention that an authoritative article on them appeared in the Irish Ecclesiastical Record Vol. 45-1935, part 2), from the pen of Father Paul Walsh. In it that famous and almost legendary seventeenth century figure "Myles the Slasher" finds a correct place. O'Reilly is occasionally found as a synonym of O'Rahilly, but this is merely an example of careless registration since O'Rahilly, which is O Raithile in Irish, has no connexion with Breffny. It is true that the sept originated in Ulster but they have so long been associated with Co. Kerry and they must be regarded as Munstermen, especially as Egan O'Rahilly 91670-1726), greatest of Munster poets - by many regarded as greatest of all Gaelic poets - was of a family long established near Killarney.

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Last Updated: Dec. 1st, 2021

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