Surname Markus Sebastian (Markus Sebastian 
) , across the world, is an extremely rare family name. The family name Markus Sebastian is habitual in Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. Much more frequently, Markus Sebastian is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Markus Sebastian | Germany, Chile, Norway |
Uhl, Schroder, and Lichtenthaeler