Surname O'Cleary (O'Cleary 
) , in the world, is a very rare last name. The cognomen O'Cleary is characteristic of Ireland, where it is a rare surname, the United Kingdom, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| O'Cleary | United States, Ireland, United Kingdom |
| ann o'cleary IE (b. 1937) |
|
|
| michael o'cleary Northern Irish election candidate |
|
|
| dermot o'cleary IE |
|