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Globally, Nishitsu (Nishitsu ) is an extremely rare unknown gender first name. Much more prevalently, Nishitsu is the last name as well as the forename.
ニシツ, and 新津
Ryo, Ippu, Masao, Kenji, Osamu, Yukio, Shigeo, Toshio, Namiko, Takashi, Takeshi, Yoshiaki, and Yoshihiro