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In the entire world, Hiroko (Hiroko , ヒロコ , Хироко ) is quite a common mostly girly, but seldom masculine first name. The first name Hiroko is characteristic of Japan, where it is quite a rare epicene name, Benin, where it is a rare feminine name, and the United States. In absolute terms, it is commonest in Japan, the United States, and China. More frequently, Hiroko is the last name as well as the forename.
Abe, Fujita, Yamada, Matsuda, Shimizu, Hayashi, Okamoto, Yoshida, Murakami, Takeuchi, Nakamura, Nakajima, Hasegawa, Ishikawa, Watanabe, Yamamoto, Yamazaki, Matsumoto, Kobayashi, Takahashi, Nishimura, Hashimoto, Hirano, Harada, Nakano, Tanaka, Ito, Ono, Ota, Mori, Sato, Arai, Kato, Goto, Wada, Maeda, Yamashita, Saito, Kondo, Inoue, Ikeda, Okada, Ogawa, Masuda, Morita, Sasaki, Suzuki, Kimura, Sakai, and Yamaguchi