In the entire world, Kalbu (Калбу 
, Kalbu 
) is quite a rare predominantly girly, but scarcely boy's first name. The given name Kalbu is habitual in Kyrgyzstan, where it is quite a common girly name, Azerbaijan, where it is quite a rare largely female, but seldom male name, and Indonesia, where it is a very rare male name. Likewise, Kalbu is the last name as well as the forename.