- Source: Oguchi (surname)
Oguchi (written: 小口 lit. "small mouth") is a Japanese surname. Notable people with the surname include:
Daihachi Oguchi (小口 大八, 1924–2008), Japanese drummer
Hisao Oguchi (小口 久雄, born 1960), Japanese businessman
Takahisa Oguchi (小口 貴久, born 1979), Japanese luger
Takako Oguchi (小口 貴子, born 1984), Japanese skeleton racer
Ōguchi, Ooguchi or Ohguchi (written: 大口 lit. "big mouth") is a separate Japanese surname, though it may be romanized the same way. Notable people with the surname include:
Hiroshi Oguchi (大口 広司, 1950–2009), Japanese musician and actor
Yoshinori Oguchi (大口 善徳, born 1955), Japanese politician