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