Characteristic
surnames
Ko, Kaji, Koko, Koki, Kozo, Koji, Kumi, Gaku, Goro, Giwa, Jobu, Jiro, Jika, Taro, Taku, Toru, Tome, Toyo, Naka, Eini, Eiko, Eiza, Aiko, Akio, Seki, Shin, Go, To, Ei, Ho, Wa, Yo, Yu, Man, Mie, Sai, Eiji, Sho, Ken, Kei, Kun, Kyu, Kyo, Ryo, Nao, Ino, Iwa, Mori, Sei, and Eiyu