Definition from Wiktionary, the free dictionary
- A surname of Irish origin, variant of Reilly.
- An English habitational surname from Ryley in Lancashire, from Old English ryge (“rye”) +leah (“clearing, meadow”).
- A manufacurer of British motorcars (1907-1969) named after William Riley Jr.
- A male given name, transferred use of the surnames since the nineteenth century.
- A female given name used since the 1990s.