Cognomen Каку (Kaku 
, 角 , 鶴 ) , around the globe, is a common family name. The last name Каку is habitual in Ghana, where it is quite a rare surname, Papua New Guinea, and Oman. Not in comparison with a country's population, the name is most common in China, India, and Nigeria. Also, Каку is the forename as well as the last name.