Last name Istvánfi (Istvánfi 
) , in all the world, is a very rare cognomen. The surname Istvánfi is habitual in Eastern Europe, particularly Hungary, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Istvánfi | Hungary |
|
istvánfi sándor jurist, HU (b. 1951) |
|
| istvánfi gyula Hungarian architect, HU (b. 1938) |
|
|
| istvánfi csaba HU (b. 1936) |
|