Last name Grampus (Crassus 
, Grampo 
, Crassius 
) , across the world, is a rare surname. The surname Grampus is habitual in France, where it is a rare surname, Venezuela, where it is a very rare surname, and the United States. Very seldom, Grampus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Crassus | Germany, United States, France, Brazil, Venezuela |
| Grampo | Spain, Brazil, United States |
| Crassius | United States, Philippines |
| Grampus | United States |
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