Worldwide, Seikichi (Seikichi 
) is a widespread boy's first name. The given name Seikichi is characteristic of Eastern Asia, particularly Japan, where it is a common boy's name. Very seldom, Seikichi is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Seikichi | Brazil, Japan, United States, Argentina, China |
| seikichi morishita (b. 1899) |
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| seikichi yamada (b. 1900) |
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| seikichi takara American artist, US (b. 1929) |
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| seikichi iha JP (b. 1932) |
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| takekawa seikichi |
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Abe, Yamada, Uehara, Shiroma, Aragaki, Kikuchi, Hayashi, Yoshida, Sakamoto, Nakamura, Nakagawa, Nakajima, Hasegawa, Ishikawa, Igarashi, Watanabe, Yamamoto, Yamazaki, Matsumoto, Kobayashi, Takahashi, Hashimoto, Oshiro, Fujita, Takagi, Tamaki, Ito, Iha, Ono, Mori, Sato, Arai, Aoki, Kato, Goto, Endo, Yamashita, Hika, Saito, Kinjo, Inoue, Ogawa, Miyagi, Sasaki, Suzuki, Kaneko, Kimura, Tanaka, Maeda, and Yamaguchi