In the entire world, ナツコ (Natsuko 
, ナツコ , Natuko 
) is quite a rare dominantly female, but uncommonly masculine forename. The first name ナツコ is characteristic of Japan, where it is quite a rare predominantly female, but scarcely boy's name, Australia, where it is a rare girly name, and Chile, where it is a very rare girly name. In absolute terms, this name is the most popular in Japan, the United States, and China. More frequently, ナツコ is the last name as well as the forename.