Last name O'Farril (O'Farril 
) , all over the world, is a very rare family name. The family name O'Farril is habitual in Nicaragua, where it is a very rare surname, Mexico, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| O'Farril | Nicaragua, United States, Mexico |
| isaac carrillo y o'farril CU (b. 1844) |
|