Cognomen Себастиен (Sebastien 
, Себастиен 
, Sebastyen 
) , across the world, is a common family name. The surname Себастиен is habitual in Dominica, where it is quite a common surname, Mauritius, and Reunion. In absolute terms, it is the most numerous in France, Cameroon, and Ivory Coast. Much more frequently, Себастиен is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sebastien | Belgium, Canada, Cameroon, Democratic Republic of the Congo, France |
| Себастиен | Russia |
| Sebastyen | Canada, Romania, United States, Spain |