Cognomen Duelo (Dolor 
, Duelo 
, Duello ) , in the world, is a common surname. The family name Duelo is habitual in Guam, where it is quite a common surname, Saint Lucia, and Philippines. In absolute terms, this name is the most popular in Philippines, Nigeria, and the United States. Much less frequently, Duelo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dolor | Philippines, France, Nigeria, United States, Italy |
| Duelo | Philippines, Spain, Argentina, United States, Brazil |
| Duello | Philippines, Argentina, United States, Brazil, Italy |