Family name Алт (Alt 
, Алт 
) , throughout the world, is a common last name. The surname Алт is characteristic of Estonia, where it is quite a common surname, Germany, and Switzerland, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Saudi Arabia. Much less frequently, Алт is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Alt | Germany, Saudi Arabia, Switzerland, United States, Brazil |
| Алт | Armenia, Russia |