Cognomen Kaldr (Kald 
, Kaldur 
, Kaldr) , around the world, is quite a common surname. The last name Kaldr is habitual in Estonia, where it is quite a common surname, Syria, where it is quite a rare surname, and Saudi Arabia. Not in comparison with a country's population, it most frequently occurs in Saudi Arabia, Egypt, and Syria. Also, Kaldr is the forename as well as the last name.