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 | Ethiopia, India, Papua New Guinea, Germany, Democratic Republic of the Congo |
| Калау | Russia, Azerbaijan, Kazakhstan |
| Kahlau | Brazil, Poland, Spain, United States, Germany |