REILY

Reily is an Irish surname that originates from the Gaelic Ó Raghallaigh, meaning "descendant of Raghallaigh". The personal name Raghallaigh is traditionally associated with the quality of being valiant or courageous, a meaning that is echoed in the translation of the root word raghallach.

The surname arose in the Irish language during the late medieval period and appears in contemporary records as early as 1572, when a James Ryley married Elizabeth Philippes at St. Andrew by the Wardrobe in London, a ceremony conducted during the reign of Queen Elizabeth I. The spelling of the name has varied considerably over time, with contemporary variants including Reilly, Riley, Rielly, Railey, and O’Reilly.

Reily is most common in Ireland today, particularly in County Cavan, a region historically associated with the O’Reilly clan. The name entered the diaspora during the 19th century, spreading to Canada, the United States, Australia and other English‑speaking countries. In the United States, significant concentrations of the surname can be found in the southeastern states, as well as in urban centres such as New Orleans, Philadelphia, Boston and New York.

In the United Kingdom the surname is less common but can be found in areas of Irish settlement, notably in parts of Liverpool and London. Records from the period of the Great Famine show the surname associated with emigration, such as a Catherine Reilly, aged twenty, who departed Liverpool bound for New York on the ship Jane in 1846.

Historical documents also record individuals of the name who were active in public life. A Hugh Reilly served as a political writer and clerk of the council in Ireland during the reign of James I, accompanying the king into exile and publishing a treatise in 1695 entitled “Ireland’s Case briefly stated.” Another, John Reilly, married Elizabeth Barry at St. Katherine by the Tower in London in 1689, indicating the presence of the family within English society.

Beyond the Irish border, the surname appears in Australian records, likely introduced by Irish settlers during the gold rushes of the mid‑19th century. These settlers brought both the name and its cultural heritage to new communities across Queensland and Western Australia.

Although the modern bearers of the name may not possess the bravery implied by the original Gaelic roots, the surname continues to serve as a linguistic link to a distinguished Celtic lineage. The association of the name with the O’Reilly clan of County Cavan remains a point of cultural pride for many families who still trace their ancestry to this ancient branch of Irish society.

Typical given names associated with the Reily surname

Male

• Anthony
• Clive
• Daniel
• Dudley
• Stephen

Female

• Carolyn
• Cheryl
• Kate
• Marion
• Paula

Similar and related surnames

Related and similar names are generated algorithmically based on the spelling, and may not necessarily share an etymology.

How to communicate the surname Reily in...

Braille

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Morse

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Semaphore

Origin: Celtic

Region of origin: British Isles

Country of origin: Ireland

Religion of origin: Christian

Language of origin: Gaelic

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