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In the entire world, 亘 (亘 , Wataru ) is quite a rare masculine first name. The first name 亘 is characteristic of Japan, where it is quite a rare boy's name, China, where it is a rare primarily masculine, but very infrequently feminine name, and the United States, where it is a very rare principally boy's, but very seldom feminine name. Also, 亘 is the last name as well as the forename.
亘 is also a name for the fictitious and mythical characters: Wataru Takagi , the fictional character from Detective Conan and Wataru Kurenai .