Family name Decaso (Decaso 
) , around the world, is a very rare cognomen. The surname Decaso is habitual in Argentina, where it is a very rare surname, Philippines, and the United States, where it is an extremely rare surname. Much less frequently, Decaso is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Decaso | United States, Spain, Argentina, Philippines |