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In the world, Nishigai (Nishigai ) is an extremely rare unknown gender forename. Much more frequently, Nishigai is the last name as well as the forename.
Nishikai, Nishimi, Nishiumi, Nisimi, Saikai, Seiki, Нисими, ニシガイ, and 西海
Daiki, Shigetatsu, and Yoshiaki