Surname Gastia (Gastia 
) , in the world, is a very rare cognomen. The cognomen Gastia is characteristic of Canada, where it is a very rare surname, Argentina, where it is an extremely rare surname, and the United States. Measured by absolute frequency, the name is most common in the United States, Canada, and Brazil. Very seldom, Gastia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gastia | Canada, Spain, Argentina, Brazil, United States |