Last name Калау (Kalau 
, Калау 
, Kahlau 
) , in all the world, is quite a rare cognomen. The family name Калау is characteristic of Papua New Guinea, where it is quite a rare surname, Germany, where it is a rare surname, and the Democratic Republic of the Congo. Likewise, Калау is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kalau | Germany, Ethiopia, Papua New Guinea, India, Democratic Republic of the Congo |
| Калау | Azerbaijan, Kazakhstan, Russia |
| Kahlau | Germany, Spain, United States, Poland, Brazil |