Surname Казуко (Kazuko 
, Казуко 
) , worldwide, is quite a rare cognomen. The surname Казуко is habitual in Japan, where it is a rare surname, Spain, where it is a very rare surname, and Myanmar. Not in comparison with a country's population, it is commonest in Japan, China, and Indonesia. More prevalently, Казуко is the forename as well as the last name.