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 | Nigeria, Brazil, Indonesia, Malawi, India |
| Kalju | Estonia, Canada, Sweden, India, Norway |
| Kalyu | Nigeria, Ethiopia, Brazil, Ukraine, India |
| Калью | Kazakhstan, Russia, Ukraine |