Across the world, Seisan (Seisan 
) is a common boy's forename. The given name Seisan is characteristic of Eastern Asia, particularly Japan, where it is quite a common boy's name.
Abe, Tamaki, Hamada, Ishida, Oshiro, Yamada, Shiroma, Shimada, Shimizu, Shibata, Akiyama, Hayashi, Yoshida, Morimoto, Michelle, Miyamoto, Sugimoto, Katayama, Nakamura, Ishikawa, Watanabe, Yamauchi, Tanaka, Kimura, Suzuki, Sasaki, Ito, Ono, Ota, Sato, Arai, Kato, Goto, Endo, Wada, Ueda, Kobayashi, Maeda, Kinjo, Fujii, Inoue, Ishii, Ikeda, Ijima, Okada, Otake, Ogura, Masuda, Saito, and Yamaguchi