Cognomen Kalg (Kalg 
) , in all the world, is a very rare last name. The surname Kalg is characteristic of Estonia, where it is a rare surname, Germany, where it is a very rare surname, and Iran. In absolute terms, it is the most numerous in Germany, Iran, and India.
| VARIANT | COUNTRY |
|---|---|
| Kalg | Germany, Iran, Estonia, United States, India |