Family name Дем'Ян-Стефан (Дем'Ян-Стефан 
) , across the world, is an extremely rare cognomen. Much more frequently, Дем'Ян-Стефан is the forename as well as the last name. Parts of the name also exists independently as a first name Дем'Ян, and a first name Стефан.
| VARIANT | COUNTRY |
|---|---|
| Дем'Ян-Стефан | Ukraine |