Last name Kallavus (Kallavus 
) , around the world, is a rare cognomen. The last name Kallavus is habitual in Estonia, where it is quite a common surname, and Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kallavus | Estonia, Russia |
|
anu kallavus Estonian mountaineer and astrologer, EE (b. 1956) |
|
| tiina kallavus Estonian pedagogue, EE (b. 1965) |
|