Cognomen جستين (Justin 
, جستين 
, Justinius 
) , in all the world, is a common last name. The surname جستين is habitual in Saint Lucia, where it is a common surname, Brunei, where it is quite a common surname, and Slovenia (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Nigeria, Cameroon, and Indonesia. More prevalently, جستين is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Justin | Australia, Myanmar, United States, Cameroon, Democratic Republic of the Congo |
| جستين | Palestinian Territory, Iraq |
| Justinius | United States, South Africa |