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Around the world, Ямагути (Soken , Yamaguchi , Hanroku , among others...) is quite a rare principally masculine, but scarcely female first name. The forename Ямагути is characteristic of Japan, where it is a rare epicene name, Saudi Arabia, where it is a rare masculine name, and China, where it is a rare primarily male, but very seldom girly name. Not in comparison with a country's population, it is commonest in China, India, and Japan. More prevalently, Ямагути is the last name as well as the forename.
Ямагути is also a name for the fictitious and mythical characters: Yamaguchi , the fictional Teenage Mutant Ninja Turtles character.