Last name O'Riada (O'Riada 
) , around the world, is a very rare cognomen. The cognomen O'Riada is characteristic of Germany, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. Very seldom, O'Riada is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| O'Riada | Spain, Germany, United States, United Kingdom |
| eoghan o'riada |
|