Cognomen Rillorta (Rillorta 
) , all around the world, is quite a rare family name. The cognomen Rillorta is habitual in Philippines, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and Saudi Arabia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Philippines, the United States, and United Arab Emirates.
| VARIANT | COUNTRY |
|---|---|
| Rillorta | Saudi Arabia, United States, United Arab Emirates, Canada, Philippines |