Characteristic
surnames
Ito, Watanabe, Nakajima, Nakamura, Tsutsuki, Kuwahara, Sakamoto, Hoshino, Hattori, Hayashi, Naganuma, Akiyama, Shimizu, Maekawa, Yamada, Ohashi, Harada, Takeda, Suzuki, Kondo, Arima, Saito, Maeda, Kono, Sato, Ono, Yamamoto, and Kobayashi
) is an extremely rare unknown gender first name.