Cognomen O'Riley (O'Riley 
) , around the globe, is a rare family name. The cognomen O'Riley is characteristic of Australia, where it is a rare surname, New Zealand, and Canada. Not in comparison with a country's population, this name is the most popular in Australia, the United States, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| O'Riley | Australia, Canada, New Zealand, United States, United Kingdom |
| bernard cornelius o'riley Roman Catholic bishop (b. 1868) |
|
|
|
don o'riley American baseball player, US (b. 1945) |
|
|
christopher o'riley American musician, US (b. 1956) |
|
| austin o'riley US (b. 1980) |
|
|
| matt o'riley English association football player (born 2000), GB |
|