Family name Callm (Callm 
) , in all the world, is a very rare surname. The family name Callm is habitual in Indonesia, where it is a very rare surname, Germany, and the United Kingdom, where it is an extremely rare surname. Much less frequently, Callm is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Callm | United Kingdom, Germany, Indonesia |