Surname ナツコ (Natsuko 
, ナツコ , Natuko 
) , in the entire world, is a common cognomen. The last name ナツコ is habitual in Japan, where it is quite a common surname, Malaysia, where it is a very rare surname, and Indonesia. Not in comparison with a country's population, the name is most common in Japan, China, and Indonesia. Much less frequently, ナツコ is the forename as well as the last name.