Family name Juanillo (Juanillo 
) , throughout the world, is a common cognomen. The family name Juanillo is characteristic of Philippines, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and Peru. Measured by absolute frequency, it is the most numerous in Philippines, Mexico, and Colombia. Very seldom, Juanillo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Juanillo | Saudi Arabia, Mexico, Colombia, Peru, Philippines |