Cognomen Piaggia (Plaga 
, Plagia 
, Piaggia ) , in the entire world, is quite a rare surname. The cognomen Piaggia is characteristic of Philippines, where it is a rare surname, Poland, and Germany. Very seldom, Piaggia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Plaga | United States, Philippines, Poland, Germany, Italy |
| Plagia | Italy, Brazil, Indonesia, Greece |
| Piaggia | Italy, Brazil |
| antonio piaggia author (15__-16__) (b. 1501) |
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carlo piaggia Italian explorer (1827-1882), IT (b. 1827) |
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| giovanni battista piaggia |
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