Surname Guaján (Guaján 
) , across the world, is an extremely rare family name. The cognomen Guaján is characteristic of Latin America and the Caribbean, particularly Ecuador, where it is a very rare surname, and Argentina, where it is an extremely rare surname. Much less frequently, Guaján is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guaján | Argentina, Ecuador |