Cognomen Kaijo (Kaijo 
) , around the world, is a common last name. The cognomen Kaijo is habitual in Japan, where it is quite a rare surname, Malaysia, where it is a very rare surname, and Germany. Much less frequently, Kaijo is the forename as well as the last name.
Mr, Koichi, Kinsan, Toshio, Tetsuo, Noboru, Yoshio, Shigeru, Atsushi, Charlie, Susumu, Kinichi, Johanna, Takeshi, Tadashi, Hiroshi, Yasushi, Masahiko, Mitsuaki, Tsuyoshi, Hare-Yasu, Kiyoshi, Shigeo, Mitsuo, Makoto, Ms, Ai, Ko, Ho, Ken, Maki, Mika, Toru, Eiyu, Maike, Sadao, Shiro, Shoji, Kazuo, Kachi, Kaoru, Kunio, Rikka, Jitsu, Hideo, Masami, Hiroyuki, and Yasuyuki