Reilly ( /ˈraɪli/) is an Irish surname (other forms include O'Reilly and Riley), and is derived from the Gaelic Ó Raghallaigh Sept that was based in Counties Cavan and Westmeath. Reilly is among the ten most frequently found surnames in Ireland and although they are very widespread they can be mostly found in the region of the ancestral homeland.
People with the surname Reilly include:
Alan Reilly, Irish footballer
Arch Reilly, American baseball player
Ben Reilly, fictional comic-book character
Brandon Reilly (musician), frontman of the band "Nightmare of You"
Brandon Reilly (American football), American football wide receiver
Brent Reilly, Australian rules footballer
Charles Herbert Reilly, English architect
Charles Nelson Reilly, American actor and director
David Reilly (singer), American singer
Dianne Reilly, Australian politician
Donald Reilly, American cartoonist
Edward Reilly (disambiguation), several people
Frank J. Reilly, American illustrator and art educator
Ike Reilly, American musician
Jack Reilly (artist), American artist
James Reilly (disambiguation), several people
Jim Reilly, Irish drummer
John Reilly (disambiguation), several people
Kelly Reilly, English actress
Kevin Reilly (disambiguation), several people
Lawrie Reilly, Scottish footballer
Long John Reilly, American baseball player
Maggie Reilly, Scottish singer
Mal Reilly, English rugby league player
Matthew Reilly, Australian Author
Mike Reilly (umpire), American baseball umpire
Paddy Reilly, Irish singer
Paul Reilly (disambiguation), several people
Pauline Neura Reilly, Australian author and ornithologist
Rick Reilly, American sportswriter
Robert D. Reilly Jr, American rear admiral
Sean Reilly, Louisiana businessman and former legislator
Sidney Reilly, a Russian-born adventurer and Secret Intelligence Service agent
Thomas Reilly (disambiguation), several people named Thomas, Tom and Tommy
Tomás Francisco Reilly (1908-1992), American-born Catholic Bishop of San Juan de la Maguana, Dominican Republic
Vini Reilly, British post-punk musician
William K. Reilly, American company director
