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Cognomen Seiko (Seiko , セイコ , Сейко ) , around the world, is a common surname. The cognomen Seiko is habitual in Japan, where it is quite a common surname, Latvia, where it is quite a rare surname, and Bulgaria, where it is a rare surname. Not in comparison with a country's population, it is commonest in Japan, Egypt, and Indonesia. Likewise, Seiko is the forename as well as the last name.
Abe, Yamada, Matsuda, Kikuchi, Hayashi, Yoshida, Murakami, Takeuchi, Nakamura, Nakayama, Nakajima, Hasegawa, Fujiwara, Ishikawa, Watanabe, Yamamoto, Yamazaki, Matsumoto, Kobayashi, Kinoshita, Takahashi, Hashimoto, Oshiro, Yamashita, Fujita, Tateno, Ito, Ono, Mori, Sato, Kato, Goto, Endo, Maeda, Saito, Kondo, Fujii, Inoue, Ishii, Ikeda, Okada, Morita, Sasaki, Suzuki, Kaneko, Kimura, Tanaka, Nakano, and Yamaguchi