Family name Szelong (Szelong 
) , in all the world, is a rare surname. The cognomen Szelong is characteristic of Czechia, where it is a rare surname, Belgium, where it is a very rare surname, and Germany. Not in comparison with a country's population, the name is most common in the United States, Germany, and Czechia. Likewise, Szelong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Szelong | Brazil, Czechia, Poland, United States, Germany |