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Across the world, Kosaku (Kosaku , Косаку ) is a rare boy's given name. The given name Kosaku is habitual in Eastern Asia, particularly Japan, where it is a very rare boy's name, and China, where it is an extremely rare boy's name. Much less frequently, Kosaku is the last name as well as the forename.
Abe, Hirano, Hirata, Fukuda, Ishida, Yamada, Matsuda, Shimada, Shimizu, Shibata, Taguchi, Hayashi, Yoshida, Takamura, Nakamura, Nakajima, Watanabe, Yamamoto, Matsumoto, Kobayashi, Takahashi, Hashimoto, Harada, Nakano, Takada, Tamura, Ito, Ono, Ota, Sato, Arai, Kato, Noda, Wada, Ueno, Ueda, Yamashita, Maeda, Inoue, Ikeda, Okada, Masuda, Morita, Sasaki, Sawada, Suzuki, Kimura, Tanaka, Saito, and Yamaguchi