Surname Szilardi (Szilardi 
) , across the world, is a rare cognomen. The surname Szilardi is habitual in Hungary, where it is a rare surname, Slovakia, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Hungary, Slovakia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Szilardi | Hungary, Canada, United States, Slovakia |