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 | France, Senegal, Cameroon, Democratic Republic of the Congo, Ivory Coast |
| Goll | Germany, France, Brazil, United States, India |
| Joule | Germany, France, United Kingdom, United States, Indonesia |
| جول | Iraq, Egypt, Sudan, Syria, Saudi Arabia |