The Reilly Family History

What Does the Reilly Surname Mean? Historical Origins Explained

The surname Reilly has its roots in Ireland and derives from the Gaelic words ‘roghallach’ and ‘raghailligh,’ which describe individuals characterized by their sociable and amiable nature. This surname exhibits several variations in spelling, including Reilley, O’Reilly, Riley, Reilly, and O’Riley. In Ireland, the Reilly surname is quite prevalent, ranking as the twelfth most common name within the population, with its origins traced back to Counties Westmeath and Cavan. In England, the Reilly surname is distributed widely across the country, as well as parts of Wales, with notable concentrations in London and Lancashire. Meanwhile, in Scotland, the Reilly name has a significant presence throughout much of the nation, particularly in the counties of Lanarkshire, Midlothian, and Angus, where it is most frequently encountered. In the United States, Reilly families initially established themselves in states such as Pennsylvania, New Jersey, Maryland, New York, and Virginia. Among the notable individuals bearing the Reilly surname are Maggie Reilly, a Scottish singer; Rick Reilly, a prominent sports broadcaster; James F. Reilly, an astronaut; John C. Reilly, an acclaimed actor; Mike “Ike” Reilly, a musician; Charles Nelson Reilly, a comic actor and director; John “Long John” Reilly, an early professional baseball player; Kelly Reilly, an English actress; David Reilly, a singer; Paul C. Reilly, an architect known for his work on New York City theaters; Donald Reilly, a cartoonist; and Matthew John Reilly, an Australian author renowned for his action thrillers.