Cognomen جول (Jules 
, Goll 
, Joule 
) , in the world, is a common last name. The last name جول is habitual in Saint Lucia, where it is a common surname, Dominica, and Seychelles, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is commonest in Cameroon, the United States, and Haiti. More prevalently, جول is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jules | Cameroon, Ivory Coast, Senegal, France, Democratic Republic of the Congo |
| Goll | Germany, United States, India, France, Brazil |
| Joule | Germany, Indonesia, United Kingdom, United States, France |
| جول | Saudi Arabia, Sudan, Syria, Egypt, Iraq |