Last name Калью (Kaliu 
, Kalju 
, Kalyu 
) , throughout the world, is a rare family name. The last name Калью is characteristic of Estonia, where it is quite a rare surname, Malawi, where it is a rare surname, and Norway. Not in comparison with a country's population, this name is the most popular in Malawi, Estonia, and Ethiopia. Likewise, Калью is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kaliu | Brazil, India, Malawi, Nigeria, Indonesia |
| Kalju | Norway, India, Canada, Estonia, Sweden |
| Kalyu | Brazil, Ethiopia, India, Nigeria, Ukraine |
| Калью | Russia, Kazakhstan, Ukraine |