Family name Каору (Kaoru 
, Kaworu 
, Caol 
) , across the world, is quite a rare cognomen. The surname Каору is characteristic of Japan, where it is quite a rare surname, Taiwan, where it is a rare surname, and Bulgaria. In absolute terms, it is commonest in Japan, China, and Indonesia. More frequently, Каору is the forename as well as the last name.