Surname Cairs (Cairs 
) , in all the world, is a very rare family name. The last name Cairs is habitual in South Africa, where it is an extremely rare surname, Spain, and the United Kingdom. Measured by absolute frequency, it most frequently occurs in South Africa, Brazil, and Spain. Very seldom, Cairs is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cairs | Spain, Brazil, United Kingdom, South Africa |