Family name Marsillo (Marsillo 
) , in all the world, is a rare cognomen. The surname Marsillo is habitual in Canada, where it is a rare surname, the United States, where it is a very rare surname, and Argentina. Not in comparison with a country's population, it is commonest in the United States, Canada, and Italy. Very seldom, Marsillo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Marsillo | Canada, Spain, Argentina, Italy, United States |