All over the world, Senichi (Senichi 
, Сиранэ 
) is an extremely rare epicene forename. Very seldom, Senichi is the last name as well as the forename.
Abe, Shimizu, Hayashi, Yoshida, Murakami, Takeuchi, Nakamura, Nakayama, Nakagawa, Nakajima, Hamazaki, Hasegawa, Fujimoto, Watanabe, Yamamoto, Yamazaki, Yoshioka, Uchiyama, Matsumoto, Kobayashi, Takahashi, Hashimoto, Yamada, Tamura, Tanaka, Kimura, Kai, Doi, Ida, Ito, Mori, Sato, Arai, Kato, Kudo, Goto, Yamashita, Endo, Maeda, Saito, Araki, Inoue, Ishii, Ogawa, Matsuo, Makino, Sasaki, Suzuki, Hara, and Matsushita