Family name Guillardo (Guillardo 
) , in all the world, is a very rare cognomen. The surname Guillardo is characteristic of Philippines, where it is a very rare surname, the United States, where it is an extremely rare surname, and Mexico. Also, Guillardo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guillardo | Brazil, Philippines, Mexico, United States, Peru |