Last name Истван (Istvan 
, Истван 
, Ystvan 
) , throughout the world, is a common surname. The last name Истван is characteristic of Hungary, where it is quite a common surname, Romania, and Serbia, where it is quite a rare surname. Also, Истван is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Istvan | Serbia, Romania, United States, Germany, Hungary |
| Истван | Russia |
| Ystvan | Brazil, Slovenia, Mexico, United States, Venezuela |