Surname Guillyan (Guillyan 
) , around the globe, is an extremely rare last name. The last name Guillyan is habitual in Latin America and the Caribbean, particularly Honduras, where it is a very rare surname, Colombia, and Mexico, where it is an extremely rare surname. Also, Guillyan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guillyan | Honduras, France, Colombia, Mexico |