Reilley is an uncommon yet distinctive given name of Irish origin. It's derived from the ancient Irish surname 'Ó Raghallaigh', which means 'descendant of Raghallach'. The name Reilley is often Anglicized from the original Irish form, Ruaidhrí, meaning 'little red king'. Historically, it has been associated with several notable figures in Irish history and lore. Today, it's often used as a given name, contributing to its unique charm.
The name Reilley peaked in popularity with 16 births registered in 2008, but it has since seen a decline, with only five births recorded each year from 2009 onwards. The highest birth count occurred between 1999 and 2002, with six to eight births per year. Overall, there have been a total of 107 babies named Reilley born between 1998 and 2016.