Surname Agdayan (Agdayan 
) , all over the world, is a very rare family name. The cognomen Agdayan is characteristic of the United States, where it is an extremely rare surname, Canada, and Philippines. In absolute terms, the name is most common in the United States, Philippines, and Mexico. Very seldom, Agdayan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Agdayan | Mexico, Philippines, Canada, United States |