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In the entire world, コウコ (コウコ ) is an extremely rare unknown gender first name. Much more frequently, コウコ is the last name as well as the forename.
Kouko
アベ, ナカ, カトウ, サトウ, ササキ, スズキ, ナガノ, ヒライ, ヨシダ, イノウエ, ヤマザキ, ワタナベ, and オオバヤシ