Surname Guaj (Guaj 
) , in the world, is an extremely rare cognomen. The last name Guaj is characteristic of Argentina, where it is a very rare surname, Brazil, where it is an extremely rare surname, and the United States. Likewise, Guaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guaj | United States, India, Brazil, Argentina |