Family name Áder (Ader 
, אדר 
, Áder 
) , worldwide, is a common cognomen. The cognomen Áder is characteristic of Estonia, where it is quite a common surname, Israel, where it is quite a rare surname, and France. Measured by absolute frequency, it is the most numerous in Ethiopia, the United States, and France. Also, Áder is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ader | Somalia, Ethiopia, United States, Democratic Republic of the Congo, France |
| אדר | Israel |
| Áder | Hungary |
| Адер | Ukraine, Russia |
|
áder jános President of Hungary (2012–2022), HU (b. 1959) |
|