Surname Istepanyan (Istepanyan 
) , in all the world, is a very rare family name. The last name Istepanyan is habitual in Western Europe, particularly Switzerland, where it is a very rare surname, France, and Germany, where it is an extremely rare surname. In absolute terms, it is the most numerous in France, the United States, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Istepanyan | Switzerland, Germany, United States, France |