Last name ארדש (Erdős 
, ארדש 
) , around the world, is a rare cognomen. The cognomen ארדש is habitual in Hungary, where it is quite a rare surname, Romania, where it is a rare surname, and Israel, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Hungary, Romania, and Germany. Very seldom, ארדש is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Erdős | Netherlands, Romania, Germany, United States, Hungary |
| ארדש | Israel |