Cognomen Plajo (Plaga 
, Plage 
, Plajo ) , in the world, is quite a rare family name. The last name Plajo is characteristic of Algeria, where it is quite a rare surname, Germany, and Philippines, where it is a rare surname. Much less frequently, Plajo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Plaga | Philippines, Poland, France, United States, Germany |
| Plage | France, Algeria, United States, Morocco, Germany |
| Plajo | Philippines |