Cognomen Istman (Istman 
) , globally, is a very rare family name. The family name Istman is characteristic of Lithuania, where it is a rare surname, Honduras, where it is a very rare surname, and Nicaragua. Very seldom, Istman is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Istman | Nicaragua, Honduras, United States, Lithuania, Venezuela |